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

#include<stdio.h>
int main()
{
 char s[101];
 int len=0;
 len=strlen(s);
 
 scanf("%s",s);
 
 for(int i=0;i<len;i++)
 {
  s[i]=x;
  };
  
  
  return 0;
  };

Compiler output:
main.c: In function 'main':
main.c:6:6: error: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
    6 |  len=strlen(s);
      |      ^~~~~~
main.c:2:1: note: include '<string.h>' or provide a declaration of 'strlen'
    1 | #include<stdio.h>
  +++ |+#include <string.h>
    2 | int main()
main.c:6:6: warning: incompatible implicit declaration of built-in function 'strlen' [-Wbuiltin-declaration-mismatch]
    6 |  len=strlen(s);
      |      ^~~~~~
main.c:6:6: note: include '<string.h>' or provide a declaration of 'strlen'
main.c:12:8: error: 'x' undeclared (first use in this function)
   12 |   s[i]=x;
      |        ^
main.c:12:8: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main(){
	string S;
  	cin >> S;
  
  	for(int i = 0; i <= S.size() ; i++){
      cout "×";
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:11: error: expected ';' before string constant
    9 |       cout "×";
      |           ^~~~
      |           ;
Language: C++

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

int main(){
	string S;
  	cin >> S;
  
  	for(int i = 0; i <= S.size() ; i++){
      cout "×"
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:11: error: expected ';' before string constant
    9 |       cout "×"
      |           ^~~~
      |           ;
Language: C++

#include <bits/stdc++.h>

#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define endl "\n"
#define PI 3.14159265358979
#define MOD 1000000007 // = 10^9 + 7

using namespace std;
using ll = long long;


void solve()
{
	string s;
	cin >> s;

	for(int i = 0; i < s.length(); ++i)
	{
		cou << "x";
	}
}

int main()
{
	fastio;
	solve();

	return 0;
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:19:17: error: 'cou' was not declared in this scope; did you mean 'cos'?
   19 |                 cou << "x";
      |                 ^~~
      |                 cos
Language: C++

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

int main() {
  string s;
  cin >> s;
  
  for(int i=0; i<s.size(); i++){
    cout << x;
    if(i==s.size()-1){
      cout << endl;
    }
  }
}


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

#include <stdio.h>
#include <string.h>

int main()
{
	char inputS[101];
	scanf("%s", inputS);

	// Get length of an inputed string
	long len = strlen(inputS);

	// Change every letter in string into 'x'
	for (int i = 0; i < len; i++)
	{
		inputS[i] = 'x';
	}

	printf_s("%s \n", inputS);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:18:9: error: implicit declaration of function 'printf_s'; did you mean 'printf'? [-Wimplicit-function-declaration]
   18 |         printf_s("%s \n", inputS);
      |         ^~~~~~~~
      |         printf
Language: C++

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

int main(){
  string S;
  int n;
  cin >> S;
  S.size()==n;
  for (int i=0;i<n;i++){
    cout << x;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:13: error: 'x' was not declared in this scope
   10 |     cout << x;
      |             ^
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define rep(i,n) for (int i=0;i < (n); ++i)
#define ALL(x) (x).begin(), (x).end()
using namespace std;
using ll = long long;
 

int main() {
    string s;
    cin >> s;
    rep(i,S.size()){
        cout << 'x';
    }
    cout << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:11: error: 'S' was not declared in this scope
   12 |     rep(i,S.size()){
      |           ^
a.cc:3:36: note: in definition of macro 'rep'
    3 | #define rep(i,n) for (int i=0;i < (n); ++i)
      |                                    ^
Language: C++

#include <iostream>
using namespace std;
int main()
{
	string s;
  	int a;
  	int i;
  
	cin >> s;
  
 	a=s.size();
  	for(i=0;i<a;i++){
      s[i]='x'
    }
  	cout << s;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:15: error: expected ';' before '}' token
   13 |       s[i]='x'
      |               ^
      |               ;
   14 |     }
      |     ~
Language: C++

using namespace std;
int main()
{
	string s;
  	int a;
  	int i;
  
	cin >> s;
  
 	a=s.size();
  	for(i=1;i<=a;i++){
      s[i]='x'
    }
  	cout << s;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:9: error: 'string' was not declared in this scope
    4 |         string s;
      |         ^~~~~~
a.cc:1:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
  +++ |+#include <string>
    1 | using namespace std;
a.cc:8:9: error: 'cin' was not declared in this scope
    8 |         cin >> s;
      |         ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:8:16: error: 's' was not declared in this scope
    8 |         cin >> s;
      |                ^
a.cc:14:9: error: 'cout' was not declared in this scope
   14 |         cout << s;
      |         ^~~~
a.cc:14:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include <iostream>
using namespace std;
int main()
{
	string s;
  	int a;
  	int i;
  
	cin >> s;
  
 	a=s.size();
  	for(i=1;i<=n;i++){
      s[i]='x'
    }
  	cout << s;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:20: error: 'n' was not declared in this scope
   12 |         for(i=1;i<=n;i++){
      |                    ^
a.cc:13:15: error: expected ';' before '}' token
   13 |       s[i]='x'
      |               ^
      |               ;
   14 |     }
      |     ~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  string s;
  cin>>s;
  int n=s.size();
  for(int i=0;i<n;i++)
  {
    cout<<"x";
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:11:4: error: expected '}' at end of input
   11 |   }
      |    ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  stirng s;
  cin >> s;
 
  for(int i=0; i<s.size(); i++){
    s[i]='x';
  }
  
  cout << s << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'stirng' was not declared in this scope
    5 |   stirng s;
      |   ^~~~~~
a.cc:6:10: error: 's' was not declared in this scope
    6 |   cin >> s;
      |          ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main()
{
    string s;  cin>>s;
   
   for(int i=0;i<s.size();i++)
   {
       string ans +='x';
   }

    cout<<ans<<endl;
  
    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:19: error: expected initializer before '+=' token
   10 |        string ans +='x';
      |                   ^~
a.cc:13:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   13 |     cout<<ans<<endl;
      |           ^~~
      |           abs
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main()
{
    string s;  cin>>s;
   
   for(int i=0;i<s.size();i++)
   {
       string ans +=x;
   }

    cout<<ans<<endl;
  
    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:19: error: expected initializer before '+=' token
   10 |        string ans +=x;
      |                   ^~
a.cc:13:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   13 |     cout<<ans<<endl;
      |           ^~~
      |           abs
Language: C++

#include <iostream>

using namespace std;

int main() {
    string s;
    cin >> s;
    for(int i = 0; i < s.size(); i++) {
        s[i] = 'x'
    }
    cout << s << endl
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:19: error: expected ';' before '}' token
    9 |         s[i] = 'x'
      |                   ^
      |                   ;
   10 |     }
      |     ~              
a.cc:11:22: error: expected ';' before '}' token
   11 |     cout << s << endl
      |                      ^
      |                      ;
   12 | }
      | ~
Language: C++

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

int main() {
  string S;
  cin >> S;
  string str = "S";
  
  for (int "x" = 0; "x" < str.size(); "x"++) {
  cout << "x" << endl;
  }

}



Compiler output:
a.cc: In function 'int main()':
a.cc:9:12: error: expected unqualified-id before string constant
    9 |   for (int "x" = 0; "x" < str.size(); "x"++) {
      |            ^~~
a.cc:9:11: error: expected ';' before string constant
    9 |   for (int "x" = 0; "x" < str.size(); "x"++) {
      |           ^~~~
      |           ;
a.cc:9:16: error: assignment of read-only location '"x"'
    9 |   for (int "x" = 0; "x" < str.size(); "x"++) {
      |            ~~~~^~~
a.cc:9:25: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    9 |   for (int "x" = 0; "x" < str.size(); "x"++) {
      |                     ~~~~^~~~~~~~~~~~
a.cc:9:37: error: expected ')' before ';' token
    9 |   for (int "x" = 0; "x" < str.size(); "x"++) {
      |       ~                             ^
      |                                     )
a.cc:9:39: error: increment of read-only location '(const char*)"x"'
    9 |   for (int "x" = 0; "x" < str.size(); "x"++) {
      |                                       ^~~
a.cc:9:39: error: lvalue required as increment operand
Language: Java

import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    Strgin s = sc.next();
    s = s.replace("[a-z]","x");
    System.out.println(s);
  }
}


Compiler output:
Main.java:5: error: cannot find symbol
    Strgin s = sc.next();
    ^
  symbol:   class Strgin
  location: class Main
1 error
Language: C++

#include <iostream>
#include <string>

int main()
{
  string str;
  cin>>str;
  
  for(int i=0;i<str.size();++i){
    cout<<'x';
  }
  

  
 return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'string' was not declared in this scope
    6 |   string str;
      |   ^~~~~~
a.cc:6:3: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:7:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |   cin>>str;
      |   ^~~
      |   std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:8: error: 'str' was not declared in this scope; did you mean 'std'?
    7 |   cin>>str;
      |        ^~~
      |        std
a.cc:10:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |     cout<<'x';
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

#include<stdio.h>
#include<string.h>
int main(void)
{
   int i,s[101],n;
   scanf("%s",s);
   n=strlen(s)
   for(i=0; i<n; i++){
      s[i]='x';
   }
   printf("%s",s);
   return 0;
}


Compiler output:
main.c: In function 'main':
main.c:7:13: error: passing argument 1 of 'strlen' from incompatible pointer type [-Wincompatible-pointer-types]
    7 |    n=strlen(s)
      |             ^
      |             |
      |             int *
In file included from main.c:2:
/usr/include/string.h:407:35: note: expected 'const char *' but argument is of type 'int *'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
main.c:7:15: error: expected ';' before 'for'
    7 |    n=strlen(s)
      |               ^
      |               ;
    8 |    for(i=0; i<n; i++){
      |    ~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using ll = long long;
int main(){
  stirng s;
  cin>>s;
  for(int i=0;i<s.size();i++){
    char c = x;
    s.at(i)= c;
    cout<<s.at(i);
  }



}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'stirng' was not declared in this scope
    6 |   stirng s;
      |   ^~~~~~
a.cc:7:8: error: 's' was not declared in this scope
    7 |   cin>>s;
      |        ^
a.cc:9:14: error: 'x' was not declared in this scope
    9 |     char c = x;
      |              ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using ll = long long;
int main(){
  stirng s;
  cin>>s;
  for(int i=0;i<s.size();i++){
    s.at(i)=x;
    cout<<s.at(i);
  }



}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'stirng' was not declared in this scope
    6 |   stirng s;
      |   ^~~~~~
a.cc:7:8: error: 's' was not declared in this scope
    7 |   cin>>s;
      |        ^
a.cc:9:13: error: 'x' was not declared in this scope
    9 |     s.at(i)=x;
      |             ^
Language: C++

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

int main(){
  string s ;
  cin >> s ;
  int a = s.size();
  for(int i =0;i<a;i++){
    s[i] = x ;
  }
  
  cout << s << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:12: error: 'x' was not declared in this scope
    9 |     s[i] = x ;
      |            ^
Language: Java

import java.util.Scanner;

class Main{
 public static void main(String args[]){
   Scanner sc = new Scanner(System.in);
   String s = sc.next();

   for(int i=0;i<s.length();i++){
  System.out.println(x);
   }
 
 }
}


Compiler output:
Main.java:9: error: cannot find symbol
  System.out.println(x);
                     ^
  symbol:   variable x
  location: class Main
1 error
Language: Java

import java.util.Scanner;

class Main{
 public static void main(String args[]){
   Scanner sc = new Scanner(System.in);
   String s = sc.next();

   for(int i=0;i<s.length();i++){
   	s.charAt(i)='x';
   }
 System.out.println(s);
 }
}


Compiler output:
Main.java:9: error: unexpected type
   	s.charAt(i)='x';
   	        ^
  required: variable
  found:    value
1 error
Language: Java

import java.util.Scanner;

class Main{
 public static void main(String args[]){
   Scanner sc = new Scanner(System.in);
   String s = sc.next();

   for(int i=0;i<s.length();i++){
   	s.charAt(i)="x";
   }
 System.out.println(s);
 }
}


Compiler output:
Main.java:9: error: unexpected type
   	s.charAt(i)="x";
   	        ^
  required: variable
  found:    value
1 error
Language: Java

import java.util.Scanner;
 
class Main{
 public static void main(String args[]){
   Scanner sc = new Scanner(System.in);
   String[] s = sc.next();
 
   for(int i=0;i<s.length;i++){
   	s.charAt(i)="x";
   }
 System.out.println(s);
 }
}

Compiler output:
Main.java:6: error: incompatible types: String cannot be converted to String[]
   String[] s = sc.next();
                       ^
Main.java:9: error: cannot find symbol
   	s.charAt(i)="x";
   	 ^
  symbol:   method charAt(int)
  location: variable s of type String[]
2 errors
Language: Java

import java.util.Scanner;

class Main{
 public static void main(String args[]){
   Scanner sc = new Scanner(System.in);
   String s = sc.next();

   for(int i=0;i<s.length;i++){
   	s.charAt(i)=x;
   }
 System.out.println(s);
 }
}

Compiler output:
Main.java:8: error: cannot find symbol
   for(int i=0;i<s.length;i++){
                  ^
  symbol:   variable length
  location: variable s of type String
Main.java:9: error: unexpected type
   	s.charAt(i)=x;
   	        ^
  required: variable
  found:    value
Main.java:9: error: cannot find symbol
   	s.charAt(i)=x;
   	            ^
  symbol:   variable x
  location: class Main
3 errors
Language: C

#include <stdio.h>
#include <string.h>

int main(void)
{
        int n;
        char s[100];

        scanf("%s",s);

        n=strlen(s);

        for(i=0;i<n;i++)
                printf("x");

        return 0;
}


Compiler output:
main.c: In function 'main':
main.c:13:13: error: 'i' undeclared (first use in this function)
   13 |         for(i=0;i<n;i++)
      |             ^
main.c:13:13: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
    string S;
    cin>>S;
    int a=S.size();
    for(int i=0; i<a; i++){
    cout<<x<<endl;
    }
    cout<<""<<endl;
}

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

#include<stdio.h>
#include<string.h>
int main()
{
  char s[101];
  unsigned int l;
  scanf("%s",s);
  l=strlen(s);
  for(i=1;i<=l;i++)
  {
    printf("x");
  }
  return 0;
}
  


Compiler output:
main.c: In function 'main':
main.c:9:7: error: 'i' undeclared (first use in this function)
    9 |   for(i=1;i<=l;i++)
      |       ^
main.c:9:7: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
#include<string.h>
int main()
{
  char s[101];
  unsigned int l;
  scanf("%s",s);
  l=strlen(s);
  for(i=1;i<=l;i++)
  {
    printf('x');
  }
  return 0;
}
  

Compiler output:
main.c: In function 'main':
main.c:9:7: error: 'i' undeclared (first use in this function)
    9 |   for(i=1;i<=l;i++)
      |       ^
main.c:9:7: note: each undeclared identifier is reported only once for each function it appears in
main.c:11:12: error: passing argument 1 of 'printf' makes pointer from integer without a cast [-Wint-conversion]
   11 |     printf('x');
      |            ^~~
      |            |
      |            int
In file included from main.c:1:
/usr/include/stdio.h:363:43: note: expected 'const char * restrict' but argument is of type 'int'
  363 | extern int printf (const char *__restrict __format, ...);
      |                    ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, srt, end) for (long long i = (srt); i < (long long)(end); i++)
#define VL vector<ll>
#define VS vector<string>

string S,T,U;
int A,B;
int main(){
    cin>>S;
    fro(int i=0;i<S.size();i++){
        cout<<'X';
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: expected primary-expression before 'int'
   12 |     fro(int i=0;i<S.size();i++){
      |         ^~~
a.cc:12:17: error: 'i' was not declared in this scope
   12 |     fro(int i=0;i<S.size();i++){
      |                 ^
Language: C++

//----------------------------------------------------------------------
#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
//----------------------------------------------------------------------

using namespace std;
using ll = long long;
using P = pair<int,int>;
using Graph = vector<vector<int>>;

int main(void) {
    string s;
    cin >> s;
    int n = s.size();
    rep(i,n)
        cout << "x"
    cout << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:20: error: expected ';' before 'cout'
   16 |         cout << "x"
      |                    ^
      |                    ;
   17 |     cout << endl;
      |     ~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    int n=s.size();
    while(n--){
        cout<<x;
    }
    cout<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:15: error: 'x' was not declared in this scope
    8 |         cout<<x;
      |               ^
Language: Java

import java.util.*;
public class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		S = S.replaceAll("[a-z]*","x");
		System.out.println(ans);
	}
}

Compiler output:
Main.java:7: error: cannot find symbol
		System.out.println(ans);
		                   ^
  symbol:   variable ans
  location: class Main
1 error
Language: Java

import java.util.*;
public class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		S = S.replaceAll([a-z]*,"x");
		System.out.println(ans);
	}
}

Compiler output:
Main.java:6: error: illegal start of expression
		S = S.replaceAll([a-z]*,"x");
		                 ^
Main.java:6: error: illegal start of expression
		S = S.replaceAll([a-z]*,"x");
		                       ^
2 errors
Language: Java

import java.util.*;

public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            String str = sc.next();
            for(int i = 0; i < str.lenght(); i++){
              System.out.println("x");
            }
          }
}

Compiler output:
Main.java:7: error: cannot find symbol
            for(int i = 0; i < str.lenght(); i++){
                                  ^
  symbol:   method lenght()
  location: variable str of type String
1 error
Language: C++

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

int main(){
  string S;
  
  cin>>S;
  for(int i=0;i<S.size();i++){
    cout<<x<<endl;
  }
}


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

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

int main(){
  string S;
  
  cin>>S;
  for(int i=0;i<S.size();i++){
    cout<<x<<endl;
  }
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namespaces'
    2 | using namespaces std;
      |       ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'string' was not declared in this scope
    5 |   string S;
      |   ^~~~~~
a.cc:5:3: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:7:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |   cin>>S;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:8: error: 'S' was not declared in this scope
    7 |   cin>>S;
      |        ^
a.cc:9:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    9 |     cout<<x<<endl;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:9:11: error: 'x' was not declared in this scope
    9 |     cout<<x<<endl;
      |           ^
a.cc:9:14: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    9 |     cout<<x<<endl;
      |              ^~~~
      |              std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <iostream>
#include <string.h>
#include <stdio.h>
using namespace std;

int strlen(char*s)
{
    int i = 0;
    while (s[i] != '\0') i++;
    return i;
}

main(){
    string S;
    int n;
    cin >> S;
    n = strlen(S);
    char s[n];

    for ( i = 0; i < n ; i++)
    {
        s[i] = 'x';
    }
    
    cout << s[] << endl;

    return 0;
}

Compiler output:
a.cc:13:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   13 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:17:15: error: no matching function for call to 'strlen(std::string&)'
   17 |     n = strlen(S);
      |         ~~~~~~^~~
In file included from a.cc:2:
/usr/include/string.h:407:15: note: candidate: 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |               ^~~~~~
/usr/include/string.h:407:35: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
a.cc:6:5: note: candidate: 'int strlen(char*)'
    6 | int strlen(char*s)
      |     ^~~~~~
a.cc:6:17: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char*'
    6 | int strlen(char*s)
      |            ~~~~~^
a.cc:20:11: error: 'i' was not declared in this scope
   20 |     for ( i = 0; i < n ; i++)
      |           ^
a.cc:25:15: error: expected primary-expression before ']' token
   25 |     cout << s[] << endl;
      |               ^
Language: C++

#include <iostream>
#include <string.h>
using namespace std;

int strlen(char*s)
{
    int i = 0;
    while (s[i] != '\0') i++;
    return i;
}

main(){
    string S;
    int n;
    cin >> S;
    n = strlen(S);
    char s[n];

    for ( i = 0; i < n ; i++)
    {
        s[i] = 'x';
    }
    
    cout << s[] << endl;

    return 0;
}

Compiler output:
a.cc:12:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   12 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:16:15: error: no matching function for call to 'strlen(std::string&)'
   16 |     n = strlen(S);
      |         ~~~~~~^~~
In file included from a.cc:2:
/usr/include/string.h:407:15: note: candidate: 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |               ^~~~~~
/usr/include/string.h:407:35: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
a.cc:5:5: note: candidate: 'int strlen(char*)'
    5 | int strlen(char*s)
      |     ^~~~~~
a.cc:5:17: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char*'
    5 | int strlen(char*s)
      |            ~~~~~^
a.cc:19:11: error: 'i' was not declared in this scope
   19 |     for ( i = 0; i < n ; i++)
      |           ^
a.cc:24:15: error: expected primary-expression before ']' token
   24 |     cout << s[] << endl;
      |               ^
Language: C++

#include <iostream>
#include <string.h>
using namespace std;

int strlen(char*s)
{
    int i = 0;
    while (s[i] != '\0') i++;
    return i;
}

main(){
    string S;
    char s[];
    int n;
    n = strlen(S);

    for ( i = 0; i < n ; i++)
    {
        s[i] = 'x';
    }
    
    cout << s[] << endl;

    return 0;
}

Compiler output:
a.cc:12:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   12 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:14:10: error: storage size of 's' isn't known
   14 |     char s[];
      |          ^
a.cc:16:15: error: no matching function for call to 'strlen(std::string&)'
   16 |     n = strlen(S);
      |         ~~~~~~^~~
In file included from a.cc:2:
/usr/include/string.h:407:15: note: candidate: 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |               ^~~~~~
/usr/include/string.h:407:35: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
a.cc:5:5: note: candidate: 'int strlen(char*)'
    5 | int strlen(char*s)
      |     ^~~~~~
a.cc:5:17: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char*'
    5 | int strlen(char*s)
      |            ~~~~~^
a.cc:18:11: error: 'i' was not declared in this scope
   18 |     for ( i = 0; i < n ; i++)
      |           ^
a.cc:23:15: error: expected primary-expression before ']' token
   23 |     cout << s[] << endl;
      |               ^
Language: C++

#include <iostream>
#include <string.h>
using namespace std;

main(){
    int size,i;
    string S;

    cin >> S;
    size = strlen(S);

    char s[size];

    for( i = 0; i < size ; i++ )
    {
        s[i] = 'x';
    }

    cout << s[size] << endl;

    return 0;
}

Compiler output:
a.cc:5:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    5 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:10:19: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
   10 |     size = strlen(S);
      |                   ^
      |                   |
      |                   std::string {aka std::__cxx11::basic_string<char>}
In file included from a.cc:2:
/usr/include/string.h:407:35: note:   initializing argument 1 of 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
Language: C++

#include <iostream>
using namespace std;

int main(){
    int size,i;
    string S;

    cin >> S;
    size = S.wstring();

    char s[size];

    for( i = 0; i < size ; i++ )
    {
        s[i] = 'x';
    }

    cout << s[size] << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:14: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'wstring'
    9 |     size = S.wstring();
      |              ^~~~~~~
Language: C++

#include <iostream>
using namespace std;

int main(){
    int size,i;
    string S;

    cin >> S;
    size = S.wstring();

    char s[size];

    for( i = 0; i < size < i++ )
    {
        s[i] = 'x';
    }

    cout << s[size] << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:14: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'wstring'
    9 |     size = S.wstring();
      |              ^~~~~~~
a.cc:13:31: error: expected ';' before ')' token
   13 |     for( i = 0; i < size < i++ )
      |                               ^~
      |                               ;
Language: C++

#include <iostream>
using namespace std;

int main(){
    int size,i;
    string S;

    cin >> S;
    size = S.length();

    char s[size];

    for( i=0; i < size < ++i)
    {
        s[i] = 'x';
    }

    cout << s[size] << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:29: error: expected ';' before ')' token
   13 |     for( i=0; i < size < ++i)
      |                             ^
      |                             ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < (int)n; i++)

int main() {
  string S;cin >> S;
  rep(i, S.size) cout << "x" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:12: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
    7 |   rep(i, S.size) cout << "x" << endl;
      |          ~~^~~~
a.cc:3:43: note: in definition of macro 'rep'
    3 | #define rep(i, n) for(int i = 0; i < (int)n; i++)
      |                                           ^
Language: C++

#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
int main(){
   string S;
   cin>>S;
   for(int i=0;i<S.size();i++){
       S.at(i)="X";
   }
   cout<<S<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:16: error: invalid conversion from 'const char*' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} [-fpermissive]
    8 |        S.at(i)="X";
      |                ^~~
      |                |
      |                const char*
Language: C++

#include<iostream>
#include<string>

using namespace std;

int main(){
  string N;
  cin>>N;
  size_t size=N.length();
  (int)(N.length());
  for(int i=0;i<N.length();i++){
    cout<<x;
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:11: error: 'x' was not declared in this scope
   12 |     cout<<x;
      |           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pi;
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define rep(i,a,b) for(int i=a;i<=b;i++)

int main(){

	ios::sync_with_stdio(0);
	cin.tie(0);


	string s; cin >> s;
	cout << "x"*s.length();


	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:20: error: invalid operands of types 'const char [2]' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} to binary 'operator*'
   19 |         cout << "x"*s.length();
      |                 ~~~^~~~~~~~~~~
      |                 |           |
      |                 |           std::__cxx11::basic_string<char>::size_type {aka long unsigned int}
      |                 const char [2]
Language: C++


#include <bits/stdc++.h>
using namespace std;
#define ll long long 
#define endl "\n"
#define pb push_back
#define f(i,n) for(i=0;i<n;i++)
#define F(i,a,b) for(i=a;a<=b;i++)
#define arr(a,n) for( i=0;i<n;i++)cin>>a[i];
#define fi first
#define se second
#define mp make_pair
#define mod 1000000007
#define YES cout<<"YES"<<endl;
#define Yes cout<<"Yes"<<endl;
#define NO cout<<"NO"<<endl;
#define No cout<<"No"<<endl;
#define yes cout<<"yes"<<endl;
#define no cout<<"no"<<endl;
#define vi vector<ll>
#define ed end()
#define bg begin()
#define sz size()
#define ln length()
#define s() sort(a,a+n);
#define sr() sort(a,a+n,greater<ll>());
#define v()  sort(v.begin(),v.end());
#define vr() sort(v.begin(),v.end(),greater<ll>());
#define mod 1000000007
#define fast() ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
ll gcd(ll a, ll b){if(!b)return a;return gcd(b, a % b);}
ll power(ll x,ll y,ll p){ll res=1;x%=p;while(y>0){if(y&1)res=(res*x)%p;y=y>>1;x=(x*x)%p;}return res;}
int main() {
   /* #ifndef ONLINE_JUDGE
        // for getting input from input.txt
        freopen("input.txt", "r", stdin);
        // for writing output to output.txt
        freopen("output.txt", "w", stdout);
    #endif*/
        /* 
        Ofcourse it's Hard.
        It's supposed to be Hard.
        If it's easy everyone would do it.
        HARD IS WHAT MAKES IT GREAT

        YESTERDAY U SAID TOMORROW

        SLOWLY BECOMING THE PERSON I 
        SHOULD HAVE BEEN A LONG TIME AGO

        SAME TASK CAN'T BE FOUND DIFFICULT TWICE

        BTBHWSITW

        SPRH TU KAB P

        CP IS ALL ABOUT THINKING 
        YOU HAVE MUCH MORE POTENTIAL THAN U THINK

        AJIT SHIDDAT 10

        UR DAILY ROUTINE 


        */

fast();
//ll t;cin>>t;while(t--)
{
    string s;
    cin>>s;
    ll n=s,length();
    for(int i=0;i<n;i++)
        cout<<"x";
    
}
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:72:10: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'long long int' in initialization
   72 |     ll n=s,length();
      |          ^
      |          |
      |          std::string {aka std::__cxx11::basic_string<char>}
a.cc:72:18: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   72 |     ll n=s,length();
      |                  ^~
a.cc:72:18: note: remove parentheses to default-initialize a variable
   72 |     ll n=s,length();
      |                  ^~
      |                  --
a.cc:72:18: note: or replace parentheses with braces to value-initialize a variable
Language: C++

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

int main() {
    string S;
    cin >> S;
    int mojisu = S.size();
    for (int i=0; i<mojisu i++){
        S,at(i) = 'x';
    }
    cout << S << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:27: error: expected ';' before 'i'
    8 |     for (int i=0; i<mojisu i++){
      |                           ^~
      |                           ;
a.cc:9:11: error: 'at' was not declared in this scope
    9 |         S,at(i) = 'x';
      |           ^~
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;

int main() {
  string s, t;
  cin >> s;
  int a = s.size()
  rep(i,a) t += 'x';
  cout << t << endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:2:18: error: expected ',' or ';' before 'for'
    2 | #define rep(i,n) for (int i = 0; i < (n); ++i)
      |                  ^~~
a.cc:9:3: note: in expansion of macro 'rep'
    9 |   rep(i,a) t += 'x';
      |   ^~~
a.cc:9:7: error: 'i' was not declared in this scope
    9 |   rep(i,a) t += 'x';
      |       ^
a.cc:2:34: note: in definition of macro 'rep'
    2 | #define rep(i,n) for (int i = 0; i < (n); ++i)
      |                                  ^
Language: C++

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

int main()
{
	string a;cin>>a;
  	ll b=a.length();
  	while(b--)
    {
      cout<<"x";
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'll' was not declared in this scope
    7 |         ll b=a.length();
      |         ^~
a.cc:8:15: error: 'b' was not declared in this scope
    8 |         while(b--)
      |               ^
Language: C++

#include<bits/stdc++.h> 
//#define <- プログラムの文字列を置換する
//typedef <- 新しい型に名前を付けるためのキーワード

using namespace std;

#define MAX_N 1
#define PI 3.14159265359
#define mod 1000000007

const long long INF = 1000000000;

int main(){
    string s;
    cin >> s;
    string ans = string();
    for(int i = 1；i <= ans.length(); i++){ 
        ans += 'x' ;
    }
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:17: error: unable to find numeric literal operator 'operator""\U0000ff1bi'
   17 |     for(int i = 1；i <= ans.length(); i++){
      |                 ^~~~
a.cc:17:42: error: expected ';' before ')' token
   17 |     for(int i = 1；i <= ans.length(); i++){
      |                                          ^
      |                                          ;
Language: C++

#include<bits/stdc++.h> 
//#define <- プログラムの文字列を置換する
//typedef <- 新しい型に名前を付けるためのキーワード

using namespace std;

#define MAX_N 1
#define PI 3.14159265359
#define mod 1000000007

const long long INF = 1000000000;

int main(){
    string s;
    cin >> s;
    string ans = string();
    for(int i = 1；i <= s.length(); i++){ 
        ans += 'x' ;
    }
    cout << ans << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:17: error: unable to find numeric literal operator 'operator""\U0000ff1bi'
   17 |     for(int i = 1；i <= s.length(); i++){
      |                 ^~~~
a.cc:17:40: error: expected ';' before ')' token
   17 |     for(int i = 1；i <= s.length(); i++){
      |                                        ^
      |                                        ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  string s;
  int  n, m, ans = -1;
  cin >> s;
  n = s.size();
  for(int i=0; i<n;i++){
    s[i] = "x";
  }
  
  cout << s <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: invalid conversion from 'const char*' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} [-fpermissive]
   10 |     s[i] = "x";
      |            ^~~
      |            |
      |            const char*
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main(){
  string str:
  cin>>str;
  for(int i=0;i<str.size();i++){
    cout<<'x';
  }
  cout<<endl;
  return(0);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:13: error: found ':' in nested-name-specifier, expected '::'
    5 |   string str:
      |             ^
      |             ::
a.cc:5:10: error: 'str' has not been declared
    5 |   string str:
      |          ^~~
a.cc:6:6: error: qualified-id in declaration before '>>' token
    6 |   cin>>str;
      |      ^~
a.cc:7:17: error: 'str' was not declared in this scope; did you mean 'std'?
    7 |   for(int i=0;i<str.size();i++){
      |                 ^~~
      |                 std
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main(){
  string str:
  for(int i=0;i<str.size();i++){
    cout<<'x';
  }
  cout<<endl;
  return(0);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:13: error: expected initializer before ':' token
    5 |   string str:
      |             ^
a.cc:6:15: error: 'i' was not declared in this scope
    6 |   for(int i=0;i<str.size();i++){
      |               ^
a.cc:6:17: error: 'str' was not declared in this scope; did you mean 'std'?
    6 |   for(int i=0;i<str.size();i++){
      |                 ^~~
      |                 std
Language: C++

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

int main() {
  string S;
  cin >> S;
  for (int i = 0; i < S.size(); i++) {
   S[r] = 'x';
  }
  cout << S <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:6: error: 'r' was not declared in this scope
    8 |    S[r] = 'x';
      |      ^
Language: C++

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

int main() {
  string S;
  cin >> S;
  for (int i = 0; i < S.size(); i++) {
   S[w] = x;
  }
  cout << S <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:6: error: 'w' was not declared in this scope
    8 |    S[w] = x;
      |      ^
a.cc:8:11: error: 'x' was not declared in this scope
    8 |    S[w] = x;
      |           ^
Language: C++

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

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

  vector<int> A(S.size()); // N個の数学の点数データ
  for (int i = 0; i < S.size(); i++) {
   cout<<x<<endl;
  }
}


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

#include<bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin>>S;
  int n=S.size();
  for(int i=0;i<n;i++){
  S.at(i)='x'
  }
  cout<<S<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: expected ';' before '}' token
    8 |   S.at(i)='x'
      |              ^
      |              ;
    9 |   }
      |   ~
Language: C++

#include <map>
#include <algorithm>
#include <iostream>
#include <vector>
#include <string>
#define rep(i,n) for(int i=0;i<n;i++)

//abbreviations
typedef long long ll;
#define vi vector<int>
#define vl vector<ll>
#define vs vector<string>
#define vb vector<bool>
#define vvi vector<vector<int>>

using namespace std;

template<typename A, size_t N, typename T>

int main(){
    string N;cin>>N;
    int x = N.size();
    cout << N.replace(0, x, x, 'x') << endl;

    return 0;
}

Compiler output:
a.cc:20:5: error: cannot declare '::main' to be a template
   20 | int main(){
      |     ^~~~
a.cc: In function 'int main()':
a.cc:21:12: error: declaration of 'std::string N' shadows template parameter
   21 |     string N;cin>>N;
      |            ^
a.cc:18:22: note: template parameter 'N' declared here
   18 | template<typename A, size_t N, typename T>
      |                      ^~~~~~
Language: C++

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

int main() {
  string s;
  cin >> s;
  for(int i = 0;i<s.size();i++) {
    cout << x;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:13: error: 'x' was not declared in this scope
    8 |     cout << x;
      |             ^
Language: C++

#include <iostream>
#include <string>
using namespace std;
int main(){
  string S;
  cin >> S;
  String ans = "";
  for(int i=0;i<S.length();++i) {
    ans += "x";
  }
  cout << ans;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'String' was not declared in this scope
    7 |   String ans = "";
      |   ^~~~~~
a.cc:9:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
    9 |     ans += "x";
      |     ^~~
      |     abs
a.cc:11:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   11 |   cout << ans;
      |           ^~~
      |           abs
Language: C++

#include <iostream>
#include <string>
using namespace std;
int main(){
  String S;
  cin >> S;
  String ans = "";
  for(int i=0;i<S.length();++i) {
    ans += "x";
  }
  cout << ans;
}

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:6:10: error: 'S' was not declared in this scope
    6 |   cin >> S;
      |          ^
a.cc:7:9: error: expected ';' before 'ans'
    7 |   String ans = "";
      |         ^~~~
      |         ;
a.cc:9:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
    9 |     ans += "x";
      |     ^~~
      |     abs
a.cc:11:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   11 |   cout << ans;
      |           ^~~
      |           abs
Language: Java

import java.io.*;

class Main {
	public static void main(String[] args) {
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		String line = reader.readLine();
		for(int i = 0; i < line.length(); i++){
			System.out.print("x");
		}
		System.out.println("");
	}
}

Compiler output:
Main.java:6: error: unreported exception IOException; must be caught or declared to be thrown
		String line = reader.readLine();
		                             ^
1 error
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
 string S;
  cin>>S;
  int N=S.size();
  string s;
  s.size()=N;
  for(int i=0;i<N;i++){
  s.at(i)='x';
  }
  cout<<s<<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: lvalue required as left operand of assignment
    8 |   s.size()=N;
      |   ~~~~~~^~
Language: C

#include<stdio.h>
#include<string.h>
int main()
{
	int i,n;
	char s[100];

	scanf("%s",s);
	n=strlen(s);
	for(i=0;i<n;i++)
		s[i]=x;
	printf("%s",s);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:22: error: 'x' undeclared (first use in this function)
   11 |                 s[i]=x;
      |                      ^
main.c:11:22: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
#include<string.h>
int main()
{
char *a;
int j;
scanf("%s",a);
  
  
  while(a[j]!="¥0")
      {
      printf("x");
    j++
       }
  
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:10:13: warning: comparison between pointer and integer
   10 |   while(a[j]!="¥0")
      |             ^~
main.c:13:8: error: expected ';' before '}' token
   13 |     j++
      |        ^
      |        ;
   14 |        }
      |        ~
Language: C

#include<stdio.h>
#include<string.h>
int main()
{
char a;
int i,j,l;
  l=0;
  for(i=0;i<100;i++)
      {
       scanf("%c",&a);
       }
  
  for(j=0;a[j]!="¥0";j++)
      {
      printf("x");
       }
  
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:13:12: error: subscripted value is neither array nor pointer nor vector
   13 |   for(j=0;a[j]!="¥0";j++)
      |            ^