criyle/codenet-compile-errors huggingface dataset:
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  cout << "A" + s.at(0) + "C"<< endl; 
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout << "A" + s.at(0) + "C"<< endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s >> ;
  cout << "A" + s.at(0) + "C"<< endl; 
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:15: error: expected primary-expression before ';' token
    6 |   cin >> s >> ;
      |               ^
a.cc:7:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout << "A" + s.at(0) + "C"<< endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s
    cout << "A" << s.at(0) << "C" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: expected ';' before 'cout'
    6 |   cin >> s
      |           ^
      |           ;
    7 |     cout << "A" << s.at(0) << "C" << endl;
      |     ~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
   string a , b , c ;
   cin >> a >> b >> c ;
  
  cout << a.at(0) << b.at(0) << c.at(0) endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:8:40: error: expected ';' before 'endl'
    8 |   cout << a.at(0) << b.at(0) << c.at(0) endl;
      |                                        ^~~~~
      |                                        ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string a,b,c;
  cin >> a >> b >> c;
  
  string ans = a.at(0) + b.at(0) + c.at(0);
  
  cout  << ans <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:34: error: conversion from 'int' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    8 |   string ans = a.at(0) + b.at(0) + c.at(0);
      |                ~~~~~~~~~~~~~~~~~~^~~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  char s;
  cin >> s;
    cout << "A"<< s.at(8) <<"C"<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:21: error: request for member 'at' in 's', which is of non-class type 'char'
    7 |     cout << "A"<< s.at(8) <<"C"<< endl;
      |                     ^~
Language: C++

\#include <bits/stdc++.h>
using namespace std;

main () {
  string A ,B ,C;
  cin >> A >> B >> C;
  
  cout << A.at(0) << B.at(0) << C.at(0) <<endl;
}

Compiler output:
a.cc:1:1: error: stray '\' in program
    1 | \#include <bits/stdc++.h>
      | ^
a.cc:1:2: error: stray '#' in program
    1 | \#include <bits/stdc++.h>
      |  ^
a.cc:1:3: error: 'include' does not name a type
    1 | \#include <bits/stdc++.h>
      |   ^~~~~~~
a.cc:4:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    4 | main () {
      | ^~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'string' was not declared in this scope
    5 |   string A ,B ,C;
      |   ^~~~~~
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> A >> B >> C;
      |   ^~~
a.cc:6:10: error: 'A' was not declared in this scope
    6 |   cin >> A >> B >> C;
      |          ^
a.cc:6:15: error: 'B' was not declared in this scope
    6 |   cin >> A >> B >> C;
      |               ^
a.cc:6:20: error: 'C' was not declared in this scope
    6 |   cin >> A >> B >> C;
      |                    ^
a.cc:8:3: error: 'cout' was not declared in this scope
    8 |   cout << A.at(0) << B.at(0) << C.at(0) <<endl;
      |   ^~~~
a.cc:8:43: error: 'endl' was not declared in this scope
    8 |   cout << A.at(0) << B.at(0) << C.at(0) <<endl;
      |                                           ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  char *s;
  cin >> s;
  string str = s.at(8);
  cout << "A" << str << "C" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:18: error: request for member 'at' in 's', which is of non-class type 'char*'
    7 |   string str = s.at(8);
      |                  ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  char *s;
  cin >> s;
  string str = s[8];
  cout << "A" << str << "C" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:19: error: conversion from 'char' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    7 |   string str = s[8];
      |                ~~~^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  getline(cin, s);
  cout<<"A"+s.at(8)+"C"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout<<"A"+s.at(8)+"C"<<endl;
      |         ~~~~~~~~~~~^~~~
      |            |        |
      |            |        const char [2]
      |            const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  getLine(cin, s);
  cout<<"A"+s.at(8)+"C"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'getLine' was not declared in this scope; did you mean 'getline'?
    6 |   getLine(cin, s);
      |   ^~~~~~~
      |   getline
a.cc:7:20: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout<<"A"+s.at(8)+"C"<<endl;
      |         ~~~~~~~~~~~^~~~
      |            |        |
      |            |        const char [2]
      |            const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin>>s;
  cout<<"A"+s.at(8)+"C"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout<<"A"+s.at(8)+"C"<<endl;
      |         ~~~~~~~~~~~^~~~
      |            |        |
      |            |        const char [2]
      |            const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  String s;
  cin>>s;
  cout<<"A"+s.at(8)+"C"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'String' was not declared in this scope
    5 |   String s;
      |   ^~~~~~
a.cc:6:8: error: 's' was not declared in this scope
    6 |   cin>>s;
      |        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string a,b,c+
    cin >> a >> b >> c;
  cout << a[0] << b[0] << c[0] <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:15: error: expected initializer before '+' token
    5 |   string a,b,c+
      |               ^
a.cc:7:27: error: 'c' was not declared in this scope
    7 |   cout << a[0] << b[0] << c[0] <<endl;
      |                           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string s, a;
    cin >> a >> s;
    cout << "A" + s[0] + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:24: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    8 |     cout << "A" + s[0] + "C" << endl;
      |                        ^ ~~~
      |                          |
      |                          const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string a,s,c;
  cin>>a>>s>>c;
  
  cou<<a.st(0)<<s.at(0)<<c.st(0)<<endl;
  
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'cou' was not declared in this scope; did you mean 'cos'?
    8 |   cou<<a.st(0)<<s.at(0)<<c.st(0)<<endl;
      |   ^~~
      |   cos
a.cc:8:10: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'st'; did you mean 'at'?
    8 |   cou<<a.st(0)<<s.at(0)<<c.st(0)<<endl;
      |          ^~
      |          at
a.cc:8:28: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'st'; did you mean 'at'?
    8 |   cou<<a.st(0)<<s.at(0)<<c.st(0)<<endl;
      |                            ^~
      |                            at
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string a,s,c;
  cin>>a>>s>>c;
  
  cou<<a<<s.at(0)<<c<<endl;
  
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'cou' was not declared in this scope; did you mean 'cos'?
    8 |   cou<<a<<s.at(0)<<c<<endl;
      |   ^~~
      |   cos
Language: C++

include<iostream>
using namespace std;

int main(){
  string s;
  while(cin>>s){
    cout<<s[0]; 
  }
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include<iostream>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'string' was not declared in this scope
    5 |   string s;
      |   ^~~~~~
a.cc:6:9: error: 'cin' was not declared in this scope
    6 |   while(cin>>s){
      |         ^~~
a.cc:6:14: error: 's' was not declared in this scope
    6 |   while(cin>>s){
      |              ^
a.cc:7:5: error: 'cout' was not declared in this scope
    7 |     cout<<s[0];
      |     ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin>>S;
  cout<<A<<S.at(0)<<C<<endl;
  
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'A' was not declared in this scope
    6 |   cout<<A<<S.at(0)<<C<<endl;
      |         ^
a.cc:6:21: error: 'C' was not declared in this scope
    6 |   cout<<A<<S.at(0)<<C<<endl;
      |                     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  string x = s.at(0);
  
  cout << "A"+x+"C" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:18: error: conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    7 |   string x = s.at(0);
      |              ~~~~^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string str;
  cin >> str;
  
  cout << A << str.at(1) << C << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'A' was not declared in this scope
    8 |   cout << A << str.at(1) << C << endl;
      |           ^
a.cc:8:29: error: 'C' was not declared in this scope
    8 |   cout << A << str.at(1) << C << endl;
      |                             ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string A,B,C;
  cin>>A>>B>>C;
  char W=B.at(0);
  cout<<"A"+W+"C"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:14: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout<<"A"+W+"C"<<endl;
      |         ~~~~~^~~~
      |            |  |
      |            |  const char [2]
      |            const char*
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string A,B,C;
  cin>>A>>B>>C;
  string W=B.at(0);
  string D="A"+W+"C";
  cout<<D<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    6 |   string W=B.at(0);
      |            ~~~~^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string A,B,C;
  cin>>A>>B>>C;
  char W=B.at(0);
  string D='A'+W+'C';
  cout<<D<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: conversion from 'int' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    7 |   string D='A'+W+'C';
      |            ~~~~~^~~~
Language: C++

#include <bits/stdc++.h>>
using namespace std;

int main() {
  getline(cin,l);
  cout << "A" << l.at(9) << "C" << endl;
}

Compiler output:
a.cc:1:25: warning: extra tokens at end of #include directive
    1 | #include <bits/stdc++.h>>
      |                         ^
a.cc: In function 'int main()':
a.cc:5:15: error: 'l' was not declared in this scope
    5 |   getline(cin,l);
      |               ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  string s;
  getline(cin,s);
  cout << "A" + s.at(8) + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout << "A" + s.at(8) + "C" << endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  string s;
  cin >> s;
  cout << "A" + s.at(8) + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout << "A" + s.at(8) + "C" << endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def SI(): return sys.stdin.readline()[:-1]

def main():
    x=SI().split()[1][0]
    print("A"+x+"C")

main()

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import sys
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
Language: Java

import java.util.*;
class Main{
  public static void main(String[] args){
    Scanner stdIn=new Scanner(System.in);
    String A = stdIn.nextInt();
    String B = stdIn.nextInt();
    String C = stdIn.nextInt();
    System.out.println("A"+C.charAt(0)+"C");
  }
}
    

Compiler output:
Main.java:5: error: incompatible types: int cannot be converted to String
    String A = stdIn.nextInt();
                            ^
Main.java:6: error: incompatible types: int cannot be converted to String
    String B = stdIn.nextInt();
                            ^
Main.java:7: error: incompatible types: int cannot be converted to String
    String C = stdIn.nextInt();
                            ^
3 errors
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string a,b;
  cin>>a>>b;
  cout<<"A"<<b.at(0)<<"C"
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:26: error: expected ';' before '}' token
    7 |   cout<<"A"<<b.at(0)<<"C"
      |                          ^
      |                          ;
    8 | }
      | ~
Language: C++

#include <iostream>
using namespace std;
int main(){
string a;
char b;
cin >> a;
b = a.st(8);
cout << 'A' << b << 'C' << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:7: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'st'; did you mean 'at'?
    7 | b = a.st(8);
      |       ^~
      |       at
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
    s-="AtCoder ";
    s-=" Contest";
  cout << "A" << s.at(0) << "C" << endl;
}




Compiler output:
a.cc: In function 'int main()':
a.cc:7:6: error: no match for 'operator-=' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'const char [9]')
    7 |     s-="AtCoder ";
      |     ~^~~~~~~~~~~~
a.cc:8:6: error: no match for 'operator-=' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'const char [9]')
    8 |     s-=" Contest";
      |     ~^~~~~~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){

  string S;
  cin >> S;
  
  char c = S.at(9);
  
  cout << A << c << C << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:11: error: 'A' was not declared in this scope
   11 |   cout << A << c << C << endl;
      |           ^
a.cc:11:21: error: 'C' was not declared in this scope
   11 |   cout << A << c << C << endl;
      |                     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string s;
  getline(cin, s)
  cout << "A" << s.at(7) << "C";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:18: error: expected ';' before 'cout'
    6 |   getline(cin, s)
      |                  ^
      |                  ;
    7 |   cout << "A" << s.at(7) << "C";
      |   ~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
	char F;
	string A,S;
	A = "A"
	
	cin >> S;
	F = S.at(8);
	A = A+F+'C';
	
	cout << A << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:16: error: expected ';' before 'cin'
    7 |         A = "A"
      |                ^
      |                ;
    8 | 
    9 |         cin >> S;
      |         ~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
	char F;
	string A,S;
	
	cin >> S;
	F = S.at(8);
	A = "A"+F+"C";
	
	cout << A << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:18: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   10 |         A = "A"+F+"C";
      |             ~~~~~^~~~
      |                |  |
      |                |  const char [2]
      |                const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {

  cin >> s;
  char s = s.at(7);
  cout << "A" << s.at(7) << "C" << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:10: error: 's' was not declared in this scope
    6 |   cin >> s;
      |          ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {

  string s;
  cin >> s;
  char s = s.at(7);
  cout << "A" << s.at(7) << "C" << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:8: error: conflicting declaration 'char s'
    8 |   char s = s.at(7);
      |        ^
a.cc:6:10: note: previous declaration as 'std::string s'
    6 |   string s;
      |          ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {

  int s;
  cin >> s;
  cout << "A" << s.at(7) << "C" << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:20: error: request for member 'at' in 's', which is of non-class type 'int'
    8 |   cout << "A" << s.at(7) << "C" << endl;
      |                    ^~
Language: C++

 #include <bits/stdc++.h>
using namespace std;

int main() {
  string S;
  cin >> S;
  cout << "A" + S.at(0) + "C" << endl;
 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout << "A" + S.at(0) + "C" << endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string N;
  cin N;
  cout << "A" << N.at(8) << C << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:6: error: expected ';' before 'N'
    6 |   cin N;
      |      ^~
      |      ;
a.cc:7:29: error: 'C' was not declared in this scope
    7 |   cout << "A" << N.at(8) << C << endl;
      |                             ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  
  char x = s.at(7);
  cout <<"A"+ x + "C"<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:17: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   cout <<"A"+ x + "C"<< endl;
      |          ~~~~~~ ^ ~~~
      |             |     |
      |             |     const char [2]
      |             const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    string s;
    cin >> s;

    char c = s.at(0)
    cout << "A" << c << "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: expected ',' or ';' before 'cout'
    9 |     cout << "A" << c << "C" << endl;
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string AtCoder, s;
  char x;
  cin >> AtCoder >> s;
  x = s.at(0);
  cout  << "A" + x + "C" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:20: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   cout  << "A" + x + "C" << endl;
      |            ~~~~~~~ ^ ~~~
      |                |     |
      |                |     const char [2]
      |                const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  str a, b, c;
  cin >> a >> b >> c;
  
  cout << a.at(0) << b.at(0) << c.at(0) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'str' was not declared in this scope; did you mean 'std'?
    5 |   str a, b, c;
      |   ^~~
      |   std
a.cc:6:10: error: 'a' was not declared in this scope
    6 |   cin >> a >> b >> c;
      |          ^
a.cc:6:15: error: 'b' was not declared in this scope
    6 |   cin >> a >> b >> c;
      |               ^
a.cc:6:20: error: 'c' was not declared in this scope
    6 |   cin >> a >> b >> c;
      |                    ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string AtCoder s Contest;
  cin >> AtCoder s Contest;
  string x;
  x=AtCodersContest;
  cout << x.at(0) << x.at(7) << x.at(8) << endl;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:4:18: error: expected initializer before 's'
    4 |   string AtCoder s Contest;
      |                  ^
a.cc:5:10: error: 'AtCoder' was not declared in this scope
    5 |   cin >> AtCoder s Contest;
      |          ^~~~~~~
a.cc:7:5: error: 'AtCodersContest' was not declared in this scope
    7 |   x=AtCodersContest;
      |     ^~~~~~~~~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string AtCoder s Contest;
  cin >> AtCoder s Contest;
  string x;
  x=AtCoder s Contest;
  cout << x.at(0) << x.at(8) << x.at(9) << endl;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:4:18: error: expected initializer before 's'
    4 |   string AtCoder s Contest;
      |                  ^
a.cc:5:10: error: 'AtCoder' was not declared in this scope
    5 |   cin >> AtCoder s Contest;
      |          ^~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
  string s;
  getline(cin, s);
  
  cout << "A" + s.at(8) + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   cout << "A" + s.at(8) + "C" << endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  int s.at(0);
  cin >> s.at(0);
  cout <<"A"<<s.at(0)<<"C"<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: expected initializer before '.' token
    7 |   int s.at(0);
      |        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;

  cout <<A<<s.at(0)<<C<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:10: error: 'A' was not declared in this scope
    8 |   cout <<A<<s.at(0)<<C<<endl;
      |          ^
a.cc:8:22: error: 'C' was not declared in this scope
    8 |   cout <<A<<s.at(0)<<C<<endl;
      |                      ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll= long long;
using vi= vector<int>;
using vvi= vector<vi>;
using vd= vector<double>;
using vvd= vector<vd>;
using vc= vector<char>;
using vb= vector<bool>;
using vl= vector<ll>;
#define rep(i,x,n) for(int i=x; i<n; i++)
#define all(x) x.begin(), x.end()

int main(){
  string at;
  char c;
  cin >> at >> c;
  cout << "A" << c << "C";
  
  return 0;
}
v

Compiler output:
a.cc:22:1: error: 'v' does not name a type; did you mean 'vl'?
   22 | v
      | ^
      | vl
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  char s[101];
  scanf("%*s %s %*s", s);
  cout << A << s[0] << C << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: 'A' was not declared in this scope
    6 |   cout << A << s[0] << C << endl;
      |           ^
a.cc:6:24: error: 'C' was not declared in this scope
    6 |   cout << A << s[0] << C << endl;
      |                        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string A,B,C;
  cin>>A>>B>>C;
  char X=A,at(0);
  char Y=B.at(0);
  char Z=C.at(0);
  cout<<XYZ<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:10: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char' in initialization
    7 |   char X=A,at(0);
      |          ^
      |          |
      |          std::string {aka std::__cxx11::basic_string<char>}
a.cc:10:9: error: 'XYZ' was not declared in this scope
   10 |   cout<<XYZ<< endl;
      |         ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string A,B,C;
  cin>>A>>B>>C;
  char X=A.at(0);
  char Y=B.at(0);
  char Z=C.at(0);
  
  cout<<XYZ<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: 'XYZ' was not declared in this scope
   11 |   cout<<XYZ<< endl;
      |         ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string A,B,C;
  cin>>A>>B>>C;
  char X=A,at(0);
  char Y=B.at(0);
  char Z=C.at(0);
  
  cout<<XYZ<< endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:10: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char' in initialization
    7 |   char X=A,at(0);
      |          ^
      |          |
      |          std::string {aka std::__cxx11::basic_string<char>}
a.cc:11:9: error: 'XYZ' was not declared in this scope
   11 |   cout<<XYZ<< endl;
      |         ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string S;
  cin >> S;
  char B=S.at(8);
   
  cout<<ABC<< endl ;
}

  

Compiler output:
a.cc: In function 'int main()':
a.cc:9:9: error: 'ABC' was not declared in this scope
    9 |   cout<<ABC<< endl ;
      |         ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string s;
  cin >> s;
  char x;
  x = s.at;
  cout << "A" << x << "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: cannot resolve overloaded function 'at' based on conversion to type 'char'
    7 |   x = s.at;
      |         ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string a,b,c;
  cin >>a>>b>>c;
  cout <<A<<b.at[0]<<C<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:10: error: 'A' was not declared in this scope
    7 |   cout <<A<<b.at[0]<<C<<endl;
      |          ^
a.cc:7:17: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    7 |   cout <<A<<b.at[0]<<C<<endl;
      |                 ^
a.cc:7:22: error: 'C' was not declared in this scope
    7 |   cout <<A<<b.at[0]<<C<<endl;
      |                      ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define dunk(n) cout << n << endl
int main() {
  string a,s,c;
  cin >> a >> s >> c;
  cout >> A >> s[0] >> C >> endl;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'A' was not declared in this scope
    8 |   cout >> A >> s[0] >> C >> endl;
      |           ^
a.cc:8:24: error: 'C' was not declared in this scope
    8 |   cout >> A >> s[0] >> C >> endl;
      |                        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string contest;
  cin >> contest;
  cout << "A" + contest.at(8) + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:31: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout << "A" + contest.at(8) + "C" << endl;
      |           ~~~~~~~~~~~~~~~~~~~ ^ ~~~
      |               |                 |
      |               const char*       const char [2]
Language: C++

#include<iostream>
using namespace std;
int main(){
  string s,t,u;cin >> s >> t >> u;
  cout << "A" << t[0] << << "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:26: error: expected primary-expression before '<<' token
    5 |   cout << "A" << t[0] << << "C" << endl;
      |                          ^~
Language: Java

import java.util.Scanner;
class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    sc.next();
    char f = sc.next().charAt[0];
    sc.close();
    System.out.println("A"+f+"C");
  }
}

Compiler output:
Main.java:6: error: cannot find symbol
    char f = sc.next().charAt[0];
                      ^
  symbol:   variable charAt
  location: class String
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  string s;
  char t;
  cin >> s;
  
  t = s.at(0);
  cout << "A" + t + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:19: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   10 |   cout << "A" + t + "C" << endl;
      |           ~~~~~~~ ^ ~~~
      |               |     |
      |               |     const char [2]
      |               const char*
Language: C++

#include <bits/stdc++>
using namespace std;

int main(){
  string a,b,c;
  cin >> a >> b >> c;
  cout << a.at(0) << b.at(0) << c.at(0) << endl;
}

Compiler output:
a.cc:1:10: fatal error: bits/stdc++: No such file or directory
    1 | #include <bits/stdc++>
      |          ^~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;

string s;

int main()
{
    cin s;
    cout<<'A'<<s.at(0)<<'C';
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:8: error: expected ';' before 's'
    8 |     cin s;
      |        ^~
      |        ;
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main{
  string a, b, c;
  cin >> a >> b >> c;
  
  cout << a.at(0) << b.at(0) << c.at(0) << endl;
}

Compiler output:
a.cc:4:5: error: cannot declare '::main' to be a global variable
    4 | int main{
      |     ^~~~
a.cc:5:10: error: expected primary-expression before 'a'
    5 |   string a, b, c;
      |          ^
a.cc:5:10: error: expected '}' before 'a'
a.cc:4:9: note: to match this '{'
    4 | int main{
      |         ^
a.cc:6:3: error: 'cin' does not name a type
    6 |   cin >> a >> b >> c;
      |   ^~~
a.cc:8:3: error: 'cout' does not name a type
    8 |   cout << a.at(0) << b.at(0) << c.at(0) << endl;
      |   ^~~~
a.cc:9:1: error: expected declaration before '}' token
    9 | }
      | ^
Language: C++

#include <bits/stdc++.h>

using namespace std;
int main()
{
   string a,b,c;
   cin>>>a;
   cin>>b;
   cin>>c;
  
   printf("A%cC",b[0]);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: expected primary-expression before '>' token
    7 |    cin>>>a;
      |         ^
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define REP(i, n) for(int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1001001001;
const int mINF = -1001001001;


int main() {
string a,c;
char b[100];
cin >> a >> b >> c;

string ans;
ans = "A" + sizeof(b[0]) + "C";
cout << ans << endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:26: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   18 | ans = "A" + sizeof(b[0]) + "C";
      |       ~~~~~~~~~~~~~~~~~~ ^ ~~~
      |           |                |
      |           const char*      const char [2]
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define REP(i, n) for(int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1001001001;
const int mINF = -1001001001;


int main() {
string a,c;
char b[100];
cin >> a >> b >> c;

string ans;
ans = "A" + b[0] + "C";
cout << ans << endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:18: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   18 | ans = "A" + b[0] + "C";
      |       ~~~~~~~~~~ ^ ~~~
      |           |        |
      |           |        const char [2]
      |           const char*
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define REP(i, n) for(int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1001001001;
const int mINF = -1001001001;


int main() {
string a,c;
char b[100];
cin >> a >> b >> c;

string ans[3];
ans = "A" + b[0] + "C";
cout << ans << endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:18: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   18 | ans = "A" + b[0] + "C";
      |       ~~~~~~~~~~ ^ ~~~
      |           |        |
      |           |        const char [2]
      |           const char*
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define REP(i, n) for(int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1001001001;
const int mINF = -1001001001;


int main() {
string a,c;
char b[100];
cin >> a >> b >> c;

char ans[3];
ans = 'A' + b[0] + 'C';
cout << ans << endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:5: error: incompatible types in assignment of 'int' to 'char [3]'
   18 | ans = 'A' + b[0] + 'C';
      | ~~~~^~~~~~~~~~~~~~~~~~
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define REP(i, n) for(int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1001001001;
const int mINF = -1001001001;


int main() {
char a,b,c;
cin >> a >> b >> c;

char ans[3];
ans = 'A' + b[0] + 'C';
cout << ans << endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:14: error: invalid types 'char[int]' for array subscript
   17 | ans = 'A' + b[0] + 'C';
      |              ^
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define REP(i, n) for(int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1001001001;
const int mINF = -1001001001;


int main() {
string a,b,c;
cin >> a >> b >> c;

string ans;
ans = "A" + b[0] + "C";
cout << ans << endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:18: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   17 | ans = "A" + b[0] + "C";
      |                  ^ ~~~
      |                    |
      |                    const char [2]
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define REP(i, n) for(int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1001001001;
const int mINF = -1001001001;


int main() {
string a,b,c;
cin >> a >> b >> c;

string ans="A" + b[0] + "C";
cout << ans << endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:23: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   16 | string ans="A" + b[0] + "C";
      |                       ^ ~~~
      |                         |
      |                         const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;
     
int main() {
  string S1, S2, S3;
  char result;
  cin >> S1 >> S2 >> S3;
  result = S2.at(0);
  //cout << result << endl;
  cout << "A" + result + "C"<< endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:24: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   10 |   cout << "A" + result + "C"<< endl;
      |           ~~~~~~~~~~~~ ^ ~~~
      |               |          |
      |               |          const char [2]
      |               const char*
Language: Java

import java.util.Scanner;
class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    sc.nextInt();
    char i = sc.nextInt().charAt(0);
    System.out.println("A"+String.valueOf(i)+"C");
  }
}

Compiler output:
Main.java:6: error: int cannot be dereferenced
    char i = sc.nextInt().charAt(0);
                         ^
1 error
Language: C++

#include<iostream>
using namespace std;

int main(){
  string A,S,C;
  char s;
  cin >> A >> S >> C;
  
  s = S.at(0);
  
  cout << "A" + s + "C" << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:19: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   11 |   cout << "A" + s + "C" << endl;
      |           ~~~~~~~ ^ ~~~
      |               |     |
      |               |     const char [2]
      |               const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  string s;
  cin >> s;
  
  cout << "A" + s.at(0) + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    8 |   cout << "A" + s.at(0) + "C" << endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

int main() {
    string A, x, B;
    cin >> A >> x >> B;
    cout << "A" << x.at(0) << "C\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:2:5: error: 'string' was not declared in this scope
    2 |     string A, x, B;
      |     ^~~~~~
a.cc:3:5: error: 'cin' was not declared in this scope
    3 |     cin >> A >> x >> B;
      |     ^~~
a.cc:3:12: error: 'A' was not declared in this scope
    3 |     cin >> A >> x >> B;
      |            ^
a.cc:3:17: error: 'x' was not declared in this scope
    3 |     cin >> A >> x >> B;
      |                 ^
a.cc:3:22: error: 'B' was not declared in this scope
    3 |     cin >> A >> x >> B;
      |                      ^
a.cc:4:5: error: 'cout' was not declared in this scope
    4 |     cout << "A" << x.at(0) << "C\n";
      |     ^~~~
Language: C

#include<stdio.h>
int main(void){
  char a[3];
  scanf("%s %s %s",&a[0],&a[1],&a[2]);
  printf("%c %c %c",a[0],a[1],a[2])
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:36: error: expected ';' before 'return'
    5 |   printf("%c %c %c",a[0],a[1],a[2])
      |                                    ^
      |                                    ;
    6 |   return 0;
      |   ~~~~~~
Language: C

#include<stdio.h>
int main(void){
  char a[3];
  scanf("%s %s %s",a[0],a[1],a[2]);
  printf("%c %c %c",a[0],a[1],a[2])
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:36: error: expected ';' before 'return'
    5 |   printf("%c %c %c",a[0],a[1],a[2])
      |                                    ^
      |                                    ;
    6 |   return 0;
      |   ~~~~~~
Language: C

#include<stdio.h>
int main(void){
  char a[3];
  scanf("%s %s %s",a[0],a[1],a[2]);
  printf("%c %c %c",&a[0],&a[1],&a[2])
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:39: error: expected ';' before 'return'
    5 |   printf("%c %c %c",&a[0],&a[1],&a[2])
      |                                       ^
      |                                       ;
    6 |   return 0;
      |   ~~~~~~
Language: C

#include<stdio.h>
int main(void){
  char a[3];
  scanf("%s %s %s",a[0],a[1],a[2]);
  printf("%c %c %c",,&a[0],&a[1],&a[2])
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:21: error: expected expression before ',' token
    5 |   printf("%c %c %c",,&a[0],&a[1],&a[2])
      |                     ^
Language: C

#include<stdio.h>
int main(void){
  char a[3];
  scanf("%s %s %s",&a[0],&a[1],&a[2]);
  printf("%c %c %c",,&a[0],&a[1],&a[2])
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:21: error: expected expression before ',' token
    5 |   printf("%c %c %c",,&a[0],&a[1],&a[2])
      |                     ^
Language: C++

#include<iostream>
using namespace std;
int main(){
  string s;cin>>s>>s;
  cout<<"A"<<s[0]<<"C\n";


Compiler output:
a.cc: In function 'int main()':
a.cc:5:26: error: expected '}' at end of input
    5 |   cout<<"A"<<s[0]<<"C\n";
      |                          ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  int one,m;
  string At,S,Co;
  cin >> At >> S >> Co;
  cout << "A" << S.at(0) << "C"
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:32: error: expected ';' before '}' token
    8 |   cout << "A" << S.at(0) << "C"
      |                                ^
      |                                ;
    9 | }
      | ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for(int i=0; i<(n); i++)
#define REP2(i,x,n) for(int i=x; i<(n); i++)
int main()
{
    string A,B,C;
    cin >> A>>B>>C;
    cout << A[0] << B[0] << C[0]endl;


   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:33: error: expected ';' before 'endl'
    9 |     cout << A[0] << B[0] << C[0]endl;
      |                                 ^~~~
      |                                 ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for(int i=0; i<(n); i++)
#define REP2(i,x,n) for(int i=x; i<(n); i++)
int main()
{
    string A,B,C;
    cin >> A>>B>>C;
    string ans = A[0]+B[0]+C[0];
    cout <<  ans<< endl;


   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:27: error: conversion from 'int' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    9 |     string ans = A[0]+B[0]+C[0];
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  char x = s.at(8);
    
    cout << "A" + x + "C" <<endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:21: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |     cout << "A" + x + "C" <<endl;
      |             ~~~~~~~ ^ ~~~
      |                 |     |
      |                 |     const char [2]
      |                 const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  char x = s.at(8);
    
    cout << A + x + C <<endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:13: error: 'A' was not declared in this scope
    9 |     cout << A + x + C <<endl;
      |             ^
a.cc:9:21: error: 'C' was not declared in this scope
    9 |     cout << A + x + C <<endl;
      |                     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  char x = s.at(0);
    
    cout << "A" + x + "C" <<endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:21: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |     cout << "A" + x + "C" <<endl;
      |             ~~~~~~~ ^ ~~~
      |                 |     |
      |                 |     const char [2]
      |                 const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  char x = s.at(0);
    
    cout << "A" + 'x' + "C" <<endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:23: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |     cout << "A" + 'x' + "C" <<endl;
      |             ~~~~~~~~~ ^ ~~~
      |                 |       |
      |                 |       const char [2]
      |                 const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin s;
  char x = s.at(0)
    
    cout << "AxC" <<endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:6: error: expected ';' before 's'
    6 |   cin s;
      |      ^~
      |      ;
a.cc:9:5: error: expected ',' or ';' before 'cout'
    9 |     cout << "AxC" <<endl;
      |     ^~~~
Language: C++

#include <stdio.h>
#include <string.h>
int main(){
  char s[100];
  char *p;
  
  gets(s);
  //for(int i=0;i<100;i++) scanf("%s",s[i]);
  
  printf("A%cC\n",s[8]);
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |   gets(s);
      |   ^~~~
      |   getw
Language: C

#include<stdio.h>
#include<string.h>
int main()
{
  char s[1000];
  char *ptr;
  char cpy[100];
  
  scanf("%s",s);
  
  ptr=strtok(s," ");
  ptr=strtok(NULL," ");
  cpy=ptr;
  
  printf("A%cC",cpy[0]);
           
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:6: error: assignment to expression with array type
   13 |   cpy=ptr;
      |      ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string A, B, C;
  cin >> A >> B >> C;
  
  cout << A.at(0) + " " + B.at(0) + " " + C.at(0) << endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:35: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    8 |   cout << A.at(0) + " " + B.at(0) + " " + C.at(0) << endl;
      |           ~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~
      |                         |           |
      |                         const char* const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string A, B, C;
  cin >> A >> B >> C;
  
  cout << A + " " + B.at(0) + " " C << endf;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:34: error: expected ';' before 'C'
    8 |   cout << A + " " + B.at(0) + " " C << endf;
      |                                  ^~
      |                                  ;
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  int A, B, C;
  cin >> A >> B >> C;
  
  cout << A + " " + B.at(0) + " " C << endf;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:23: error: request for member 'at' in 'B', which is of non-class type 'int'
    8 |   cout << A + " " + B.at(0) + " " C << endf;
      |                       ^~
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main(){
  string[] s;
  cin >> s[0] >> s[1] >> s[2];
  cout << s[0][0]+s[1][0]+s[2][0];
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: structured binding declaration cannot have type 'std::string' {aka 'std::__cxx11::basic_string<char>'}
    5 |   string[] s;
      |         ^~
a.cc:5:9: note: type must be cv-qualified 'auto' or reference to cv-qualified 'auto'
a.cc:5:9: error: empty structured binding declaration
a.cc:5:12: error: expected initializer before 's'
    5 |   string[] s;
      |            ^
a.cc:6:10: error: 's' was not declared in this scope
    6 |   cin >> s[0] >> s[1] >> s[2];
      |          ^
Language: C++

#include<iostream>
#include<string>
using namespace std 
  
int main(){
  string s,t,u ;
  cin >> s >> t >> u ;
  cout << 'A' << t.at(0) << 'C' << endl ;
}

Compiler output:
a.cc:3:20: error: expected ';' before 'int'
    3 | using namespace std
      |                    ^
      |                    ;
    4 | 
    5 | int main(){
      | ~~~
Language: C++

#include<iostream>
#include<string>
using namespace std 
  
int main(){
  string s,t,u ;
  sin >> s >> t >> u ;
  cout << 'A' << t.at(0) << 'C' << endl ;
}

Compiler output:
a.cc:3:20: error: expected ';' before 'int'
    3 | using namespace std
      |                    ^
      |                    ;
    4 | 
    5 | int main(){
      | ~~~                 
a.cc: In function 'int main()':
a.cc:7:3: error: 'sin' was not declared in this scope
    7 |   sin >> s >> t >> u ;
      |   ^~~