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

#include <bits/stdc++.h>

#define forn(i, n) for (int i = 0; i < int(n); ++i)
#define for1(i, n) for (int i = 1; i <= int(n); ++i)
#define fore(i, l, r) for (int i = int(l); i <= int(r); ++i)
#define ford(i, n) for (int i = int(n)-1; i >= 0; --i)
#define pb push_back
#define eb emplace_back
#define ms(a, x) memset(a, x, sizeof(a))
#define F first
#define S second
#define endl '\n'
#define de(x) cout<<#x<<" = "<<(x)<<endl
#define de2(x,y) cout<<#x<<" = "<<(x) <<' '<< #y<<" = "<<y<<endl;

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
const int INF = 0x3f3f3f3f;
mt19937 gen(chrono::high_resolution_clock::now().time_since_epoch().count());

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
	string st;
	forn(i,st.size() cout<<'x';
    return 0;
}

Compiler output:
a.cc:29:2: error: unterminated argument list invoking macro "forn"
   29 | }
      |  ^
a.cc: In function 'int main()':
a.cc:27:9: error: 'forn' was not declared in this scope
   27 |         forn(i,st.size() cout<<'x';
      |         ^~~~
a.cc:27:13: error: expected '}' at end of input
   27 |         forn(i,st.size() cout<<'x';
      |             ^
a.cc:23:12: note: to match this '{'
   23 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
  char str[10000];
  cin >> str;
  int len = strlen(str);
  for(int i=1;i<=len;i++)
  {
    cout << x ;
  }
  cout << endl;
  return 0;
}

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<algorithm>
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:4:3: error: 'string' was not declared in this scope
    4 |   string s;
      |   ^~~~~~
a.cc:2:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
    1 | #include<algorithm>
  +++ |+#include <string>
    2 | using namespace std;
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   cin>>s;
      |   ^~~
a.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    1 | #include<algorithm>
  +++ |+#include <iostream>
    2 | using namespace std;
a.cc:5:8: error: 's' was not declared in this scope
    5 |   cin>>s;
      |        ^
a.cc:8:5: error: 'cout' was not declared in this scope
    8 |     cout<<"x";
      |     ^~~~
a.cc:8:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <string>

#define ll long long
#define REP(i,n) for(int i = 0; i < n; i++)
#define PI 3.141592653589

using namespace std;

int gcd(int a, int b);
int lcm(int a, int b);

void solve_A(){
    
}

void solve_B(){
    int n;
    char s[140];
    cin >> s;

    n = strlen(s);
    REP(i,n) cout << "x";
}

void solve_C(){
    int n;
    cin >> n;

    /*
    int a[n];
    int* num;
    num = (int*)calloc(1000000010, sizeof(int));
    if(num == NULL) exit(1);

    int flag = 0;
    REP(i,n){
        cin >> a[i];
        num[a[i]] ++;
        if(num[a[i]] == 2){
            flag ++;
            break;
        }
    }

    if(flag == 0) cout << "YES";
    else cout << "NO";
    */

    int a[n];
    REP(i,n) cin >> a[i];

    bool flag = false;
    sort(a, a+n);
    REP(i,n-1){
        if(a[i] == a[i+1]) flag = true;
    }

    if(flag) cout << "NO";
    else cout << "YES";

    // free(num);
}

double Expect(int n){
    return (double) (n + 1) / 2;
}

void solve_D(){
    int n, k;
    cin >> n >> k;

    int p[n];
    double e[n];
    double sum = 0.0;
    REP(i,n){
        cin >> p[i];
        sum += Expect(p[i]);
        e[i] = sum;
    }

    double ans = 0;

    if(k != n){
        REP(i, n-k){
            if(ans <= e[i+k] - e[i]) ans = e[i+k] - e[i];
        }
    } else{
        ans = e[n-1];
    }
    
    printf("%.10f", ans);
}

int main(void){
    solve_B();
    return 0;
}

int gcd(int a, int b){
    if(a < b) swap(a, b);

    int r = a % b;
    while(r != 0){
        a = b;  b = r;  r = a % b;
    }
    return b;
}

int lcm(int a, int b){
    return a * b / gcd(a, b);
}

Compiler output:
a.cc: In function 'void solve_B()':
a.cc:25:9: error: 'strlen' was not declared in this scope
   25 |     n = strlen(s);
      |         ^~~~~~
a.cc:5:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    4 | #include <cmath>
  +++ |+#include <cstring>
    5 | #include <string>
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";
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:9:12: error: expected '}' at end of input
    9 |   return 0;
      |            ^
a.cc:4:2: note: to match this '{'
    4 |  {
      |  ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
    char a[101];
    gets(a);
    for(int i=0;i<strlen(a);i++)
        cout<<"x";
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    6 |     gets(a);
      |     ^~~~
      |     getw
Language: C++

#include<iostream>
#include<string>

using namespace std;

int main(){
  string m;
  cin>>m;
  int num;
  num=sizeof(m)/sizeof(*m);
  for(int i=0; i<=num-1; i++){
    m[i]="x";
  }
  cout<<m;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:24: error: no match for 'operator*' (operand type is 'std::string' {aka 'std::__cxx11::basic_string<char>'})
   10 |   num=sizeof(m)/sizeof(*m);
      |                        ^~
a.cc:12:10: error: invalid conversion from 'const char*' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} [-fpermissive]
   12 |     m[i]="x";
      |          ^~~
      |          |
      |          const char*
Language: C++

#include<iostream>
#include<string>

using namespace std;

int main(){
  char m;
  cin>>m;
  int num;
  num=length(m);
  for(int i=1; i<=num; i++){
    cout<<"x";
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:7: error: 'length' was not declared in this scope
   10 |   num=length(m);
      |       ^~~~~~
Language: C++

#include<iostream>
#include<string>

using namespace std;

int main(){
  string m;
  cin>>m;
  int num;
  num=strlen(m);
  for(int i=1; i<=num; i++){
    cout<<"x";
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:7: error: 'strlen' was not declared in this scope
   10 |   num=strlen(m);
      |       ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | #include<string>
Language: C++

#include<iostream>
#include<string>

using namespace std;

int main(){
  string m;
  cin>>m;
  int num;
  num=length(m);
  for(int i=1; i<=num; i++){
    cout<<"x";
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:7: error: 'length' was not declared in this scope
   10 |   num=length(m);
      |       ^~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  char s[100];
  for(int i=0;s[i]!='\0';i++)
    cin>>s[i];
  for(int i=0;i<s[i]!='\0';i++);
   // int len=i;
  for(int j=i;j>0;j--)
    cout<<'x';
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:13: error: 'i' was not declared in this scope
   10 |   for(int j=i;j>0;j--)
      |             ^
Language: C++

#include<bits/stdc++.h>
#include<string.h>
using namespace std;
int main()
{
  string s;
  cin>>s;
  int len=strlen(s);
  for(int j=len;j>0;j--)
  {
    cout<<'x';
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
    8 |   int len=strlen(s);
      |                  ^
      |                  |
      |                  std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/cstring:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:121,
                 from a.cc:1:
/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<bits/stdc++.h>
using namespace std;

int main()
{
	char s[100],a[100];
	gets(s);
	for (int i = 1; i < strlen(s); ++i)
	{
		/* code */
		a[i]='x';
	}
	string str(a);
	strcpy(s,a);
	puts(s);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |         gets(s);
      |         ^~~~
      |         getw
Language: C++

#include<iostream>
using namespace std;
int main()
{
  char s[100];
  gets(s);
  int len=1;
  for(int i=0;s[i]!='\0';i++)
  { 
    len++;
  }
  for(int j=len;j>0;j--)
  {
    cout<<'x';
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'gets' was not declared in this scope; did you mean 'getw'?
    6 |   gets(s);
      |   ^~~~
      |   getw
Language: C++

#include<iostream>
using namespace std;
int main()
{
  char s[100];
  cin>>s;
  for(int i=0;s[i]!='\0';i++);
  int len=i;
  for(int j=len;j>0;j--)
  {
    cout<<'x';
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'i' was not declared in this scope
    8 |   int len=i;
      |           ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:3:3: error: 'string' was not declared in this scope
    3 |   string s;
      |   ^~~~~~
a.cc:3:3: 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:4:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 |   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:4:8: error: 's' was not declared in this scope
    4 |   cin>>s;
      |        ^
a.cc:7:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   cout<<s;
      |   ^~~~
      |   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 <iostream>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;
 
int main() {
  int num;	
  string s,x;
    cin >> s
    num =s.size();
    rep(i,num) x[i]=s[0];
   cout<<x<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:13: error: expected ';' before 'num'
    8 |     cin >> s
      |             ^
      |             ;
    9 |     num =s.size();
      |     ~~~
Language: C++

#include <iostream>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;
 
int main() {
  int num;	
  string s,x;
    cin >> s
    num =s.size()
    rep(i,num)  x[i]=s[0]
   cout<<x<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:13: error: expected ';' before 'num'
    8 |     cin >> s
      |             ^
      |             ;
    9 |     num =s.size()
      |     ~~~      
a.cc:10:9: error: 'i' was not declared in this scope
   10 |     rep(i,num)  x[i]=s[0]
      |         ^
a.cc:2:35: note: in definition of macro 'rep'
    2 | #define rep(i, n) for (int i = 0; i < (int)(n); i++)
      |                                   ^
Language: C

#include <stdio.h>
int main(void)
{
  char S[100];

  scanf("%s", S);
  
  for(int i=0; i++; S[i] != {\0}){
    S[i] = 'x';
  }
  
  printf("%s", S);
  
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:8:29: error: expected expression before '{' token
    8 |   for(int i=0; i++; S[i] != {\0}){
      |                             ^
main.c:8:30: error: stray '\' in program
    8 |   for(int i=0; i++; S[i] != {\0}){
      |                              ^
Language: C

#include <stdio.h>
int main(void)
{
  char S[100];

  scanf("%s", S);
  
  for(int i=0; i++; S[i] != \0){
    S[i] = x;
  }
  
  printf("%s", S);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:29: error: stray '\' in program
    8 |   for(int i=0; i++; S[i] != \0){
      |                             ^
main.c:9:12: error: 'x' undeclared (first use in this function)
    9 |     S[i] = x;
      |            ^
main.c:9:12: 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();
    
  char B = "x";
  
  for(int i = 0; i < A; i++) {
    
    
    S.at(i) = B;
    
  }
  cout << S << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:12: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
   12 |   char B = "x";
      |            ^~~
      |            |
      |            const char*
Language: C

#include<stdio.h>
int main(void){
  int i;
  int a=0;
  char s[100];
  for(i=0;s[i]!=='\0';i++){
    a+=1;
  }
  for(i=0;i<a;i++){
    s[i]='x';
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:17: error: expected expression before '=' token
    6 |   for(i=0;s[i]!=='\0';i++){
      |                 ^
Language: C

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
  int i;
 	char a[100];
  scanf("%s",a);
  for (i=0;i<strlen(a);i++)
    a[i]='x';
  printf("%s",a);
}
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
  int i;
 	char a[100];
  scanf("%s",a);
  for (i=0;i<strlen(a);i++)
    a[i]='x';
  printf("%s",a);
}


Compiler output:
main.c:16:5: error: redefinition of 'main'
   16 | int main()
      |     ^~~~
main.c:4:5: note: previous definition of 'main' with type 'int()'
    4 | int main()
      |     ^~~~
Language: C

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
  int i;
 	char a[100];
  scanf("%s",a);
  for (i=0;i<strlen(a);i++)
    a[i]='x';
  printf("%s",a);
}
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
  int i;
 	char a[100];
  scanf("%s",a);
  for (i=0;i<strlen(a);i++)
    a[i]='x';
  printf("%s",a);
}
Submissi

Compiler output:
main.c:16:5: error: redefinition of 'main'
   16 | int main()
      |     ^~~~
main.c:4:5: note: previous definition of 'main' with type 'int()'
    4 | int main()
      |     ^~~~
main.c:25:1: error: expected '=', ',', ';', 'asm' or '__attribute__' at end of input
   25 | Submissi
      | ^~~~~~~~
Language: C++

#include<string>
#include<stdio.h>
#include<iostream>
using namespace std;
int main() {
	char S;
	scanf("%s",&S);
	int hosikawa;
	hosikawa = S.length();
	for (int i = 0; i < hosikawa; i++) {
		S.at(i) = '×';
	}
	cout << S;
	return 0;
}

Compiler output:
a.cc:11:27: warning: multi-character character constant [-Wmultichar]
   11 |                 S.at(i) = '×';
      |                           ^~~
a.cc: In function 'int main()':
a.cc:9:22: error: request for member 'length' in 'S', which is of non-class type 'char'
    9 |         hosikawa = S.length();
      |                      ^~~~~~
a.cc:11:19: error: request for member 'at' in 'S', which is of non-class type 'char'
   11 |                 S.at(i) = '×';
      |                   ^~
Language: C++

#include<string>
#include<iostream>
using namespace    std;
int main() {
	string S;
	scanf("%s", S);
	int hosikawa;
	hosikawa = S.length();
	for (int i = 0; i < hosikawa; i++) {
		S.at(i) = '×';
	}
	cout << S;
	return 0;


Compiler output:
a.cc:10:27: warning: multi-character character constant [-Wmultichar]
   10 |                 S.at(i) = '×';
      |                           ^~~
a.cc: In function 'int main()':
a.cc:10:27: warning: overflow in conversion from 'int' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} changes value from '50071' to '-105' [-Woverflow]
a.cc:13:18: error: expected '}' at end of input
   13 |         return 0;
      |                  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: expected ',' or ';' before 'cout'
   10 |     cout << S << endl;
      |     ^~~~
Language: C++

#include<stdio.h>
#include<string.h>
int main()
{char s[110],x[110]={'\0'};
gets(s);
for(int i=0;s[i]!='\0';i++)
	x[i]='x';
puts(x);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:1: error: 'gets' was not declared in this scope; did you mean 'getw'?
    5 | gets(s);
      | ^~~~
      | getw
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:19: error: 'length' was not declared in this scope
    8 |   for (int i=1;i<=length(s);i++)
      |                   ^~~~~~
Language: C

#include <stdio.h>

int main()
{
  char s[];
  int i=0;
  while (s[i]!='\0') {
    i++;
  }
  for (int j=0;j<i;j++) {
    printf("x");
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:8: error: array size missing in 's'
    5 |   char s[];
      |        ^
Language: C++

#include<iostream>

using namespace std;

int main(void){
  string s;
  cin >>s;
  for(int i = 0; i<sizeof(s); i++){
    s[i] = "x";
  }
  cout<<s<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:12: error: invalid conversion from 'const char*' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} [-fpermissive]
    9 |     s[i] = "x";
      |            ^~~
      |            |
      |            const char*
Language: C++

#include <iostream>
#include <string>

using namespace std;

int main(){
    char s[100];
    cin>>s;
    int len=strlen(s);
    char x[100];
    for(int i=0;i<len;i++)
        s[i]+='\0';
    for(int i=0;i<len;i++)
        s[i]+='x';

    cout<<s<<endl;   
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:13: error: 'strlen' was not declared in this scope
    9 |     int len=strlen(s);
      |             ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include <iostream>
  +++ |+#include <cstring>
    2 | #include <string>
Language: C++

#include<stdio.h>
#include<string.h>
int main()
{char s[110];
gets(s);
for(int i=0;s[i]!='\0';i++)
	printf("x");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:1: error: 'gets' was not declared in this scope; did you mean 'getw'?
    5 | gets(s);
      | ^~~~
      | getw
Language: C

#include<stdio.h>
#include<string.h>
char  a[105];
int main()
{
	gets_s(a);
	int i;
	for (i = 0;i<=strlen(a); i++)
	{
		if ((a[i] >= 'a' && a[i] <= 'z') || (a[i] >= 'A' && a[i] <= 'Z'))
			a[i] = 'x';
	}
	for (i = 0; i <= strlen(a); i++)
	{
		printf("%c", a[i]);
	}
	printf("\n");
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:9: error: implicit declaration of function 'gets_s' [-Wimplicit-function-declaration]
    6 |         gets_s(a);
      |         ^~~~~~
Language: C++

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

int main()
{
    string A;
    cin >> A ;
    int B = A.length();
    string C = "x";
    string X ="";
    for (int i = 0 ; i < B ; i++){
        X = X + C;
    }
    cout << B << endl;
    cout<< X << endl;
}f

Compiler output:
a.cc:18:2: error: 'f' does not name a type
   18 | }f
      |  ^
Language: C

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

Compiler output:
main.c: In function 'main':
main.c:12:16: error: expected ';' before '}' token
   12 |     strcat(b,c)
      |                ^
      |                ;
   13 |   }
      |   ~
Language: C

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

Compiler output:
main.c: In function 'main':
main.c:12:7: error: assignment to expression with array type
   12 |     b = strcat(c,b)
      |       ^
main.c:12:20: error: expected ';' before '}' token
   12 |     b = strcat(c,b)
      |                    ^
      |                    ;
   13 |   }
      |   ~
Language: C++

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

int main() {
  string s;
  
  cin >> s;
  
  for(int i==0;i<=strlen(s);i++) {
    s[i] =　"x";
  }

  cout <<s<<endl;
}

Compiler output:
a.cc:10:11: error: extended character 　 is not valid in an identifier
   10 |     s[i] =　"x";
      |           ^
a.cc: In function 'int main()':
a.cc:9:12: error: expected ';' before '==' token
    9 |   for(int i==0;i<=strlen(s);i++) {
      |            ^~
      |            ;
a.cc:9:12: error: expected primary-expression before '==' token
    9 |   for(int i==0;i<=strlen(s);i++) {
      |            ^~
a.cc:9:26: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
    9 |   for(int i==0;i<=strlen(s);i++) {
      |                          ^
      |                          |
      |                          std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/cstring:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:121,
                 from a.cc:1:
/usr/include/string.h:407:35: note:   initializing argument 1 of 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
a.cc:9:28: error: expected ')' before ';' token
    9 |   for(int i==0;i<=strlen(s);i++) {
      |      ~                     ^
      |                            )
a.cc:9:29: error: 'i' was not declared in this scope
    9 |   for(int i==0;i<=strlen(s);i++) {
      |                             ^
Language: C++

#include <iostream>
#include <string>

using namespace std;

int main(){
    char s[100];
    cin>>s;
    int len=strlen(s);
    char x[100];
    for(int i=0;i<len;i++)
        x[i]+='x';

    if(strcmp(s,x)==0){
        cout<<s<<endl;   
    }else if(strcmp(s,x)!=0){
        cout<<x<<endl;
    }

    return 0;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:13: error: 'strlen' was not declared in this scope
    9 |     int len=strlen(s);
      |             ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include <iostream>
  +++ |+#include <cstring>
    2 | #include <string>
a.cc:14:8: error: 'strcmp' was not declared in this scope
   14 |     if(strcmp(s,x)==0){
      |        ^~~~~~
a.cc:14:8: note: 'strcmp' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
Language: C

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

Compiler output:
main.c: In function 'main':
main.c:11:7: error: 'i' undeclared (first use in this function)
   11 |   for(i = 1; i < a; i = i + 1){
      |       ^
main.c:11:7: note: each undeclared identifier is reported only once for each function it appears in
main.c:12:7: error: assignment to expression with array type
   12 |     b = strcat(c,b)
      |       ^
main.c:12:20: error: expected ';' before '}' token
   12 |     b = strcat(c,b)
      |                    ^
      |                    ;
   13 |   }
      |   ~
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:8:15: error: expected ';' before '}' token
    8 |      cout<<"x"
      |               ^
      |               ;
    9 |  }
      |  ~
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;
	}
	cout << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:25: error: 'x' was not declared in this scope
    9 |                 cout << x;
      |                         ^
Language: Java

import java.util.Scanner;
import java.util.ArrayList;
 
public class Main {
    public static void main(String[] args) {
      Scanner scan = new Scanner(System.in);
	  String str = scan.next();
      
      // 変数strの長さ分回す
      for (int i = 0; i < str.length(); i++) {
          // 配列に順番に格納する
          strArray[i] = "x";
      }
      
      StringBuilder sb = new StringBuilder();
      for(int i =0; i < strArray.length(); i++){
		sb.append(i); 
      }
		
	  System.out.println(sb.toString());// あいうえお
      
    }
}

Compiler output:
Main.java:12: error: cannot find symbol
          strArray[i] = "x";
          ^
  symbol:   variable strArray
  location: class Main
Main.java:16: error: cannot find symbol
      for(int i =0; i < strArray.length(); i++){
                        ^
  symbol:   variable strArray
  location: class Main
2 errors
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class Main {
 
    public static void main(String[] args) {
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
 		String input = null;
      
        try {
            input = br.readLine();
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
      
		int len = input.length();
        String ret = null;
      	for (int i = 0; i =< len; i++){
          ret = ret + "x";
        }
        System.out.println(ret);
    }
 
}


Compiler output:
Main.java:21: error: > or ',' expected
      	for (int i = 0; i =< len; i++){
      	                        ^
1 error
Language: Java

mport java.util.Scanner;
import java.util.ArrayList;
 
public class Main {
    public static void main(String[] args) {
      Scanner scan = new Scanner(System.in);
	  String str = scan.next();
      
      // 変数strの長さ分回す
      for (int i = 0; i < str.length(); i++) {
          // 配列に順番に格納する
          strArray[i] = "x";
      }
      
      StringBuilder sb = new StringBuilder();
      for(int i =0; i < strArray.length(); i++){
		sb.append(i); 
      }
		
	  System.out.println(sb.toString());// あいうえお
      
    }
}

Compiler output:
Main.java:1: error: class, interface, enum, or record expected
mport java.util.Scanner;
^
Main.java:2: error: class, interface, enum, or record expected
import java.util.ArrayList;
^
2 errors
Language: C++

#include <iostream>
#include <string>

using namespace std;

int main(){
    char s[1000],t[1000];
    int a,b;
    char u[1000];

    cin>>s;
    int len=strlen(s);
    char x[1000];
    for(int i=0;i<len;i++)
        x[i]+='x';

    if(strcmp(s,x)==0){
        cout<<x<<endl;   
    }else if(strcmp(s,x)!=0){
        cout<<s<<endl;
    }

    //cout<<x<<endl;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:13: error: 'strlen' was not declared in this scope
   12 |     int len=strlen(s);
      |             ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include <iostream>
  +++ |+#include <cstring>
    2 | #include <string>
a.cc:17:8: error: 'strcmp' was not declared in this scope
   17 |     if(strcmp(s,x)==0){
      |        ^~~~~~
a.cc:17:8: note: 'strcmp' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class Main {
 
    public static void main(String[] args) {
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
 		String input = null;
      
        try {
            input = br.readLine();
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
      
		int len = input.length();
        String ret = null;
      	for (int i = 0; i = len; i++){
          ret = ret + "x";
        }
        System.out.println(ret);
    }
 
}


Compiler output:
Main.java:21: error: incompatible types: int cannot be converted to boolean
      	for (int i = 0; i = len; i++){
      	                  ^
1 error
Language: C++

/*
   Creator - Glitched
   Yeet!!
*/

#include "bits/stdc++.h"
#include "stdlib.h"
using namespace std;
#define testcases ll t;cin>>t;while(t--)
#define queries ll q;cin>>q;while(q--)
#define ll long long
#define loop(i,x,n) for(ll i=x;i<n;i++)

#define ff first
#define ss second
#define pb push_back
#define elif else if
#define flush cout<<"\n"
#define mod 1000000007
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);

int main()
{   
    string s;cin>>s;ll n = s.size();
    loop(i,0,n){
        cout<<x;
    }

    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:15: error: 'x' was not declared in this scope
   26 |         cout<<x;
      |               ^
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class Main {
 
    public static void main(String[] args) {
 
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
 		String input = null;
        try {
            input = br.readLine();
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
      
		int len = input.length();
        String ret = null;
      	for (i = 0; i < len; i++){
          ret = ret + "x";
        }
          
        System.out.println(ret);
 
    }
 
}


Compiler output:
Main.java:21: error: cannot find symbol
      	for (i = 0; i < len; i++){
      	     ^
  symbol:   variable i
  location: class Main
Main.java:21: error: cannot find symbol
      	for (i = 0; i < len; i++){
      	            ^
  symbol:   variable i
  location: class Main
Main.java:21: error: cannot find symbol
      	for (i = 0; i < len; i++){
      	                     ^
  symbol:   variable i
  location: class Main
3 errors
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class Main {
 
    public static void main(String[] args) {
 
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
 		String input = null;
        try {
            input = br.readLine();
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
      
		int len = input.length();
        String ret = null;
      	for (i = 0; i < len; i++;){
          ret = ret + "x";
        }
          
        System.out.println(ret);
 
    }
 
}

Compiler output:
Main.java:21: error: ')' expected
      	for (i = 0; i < len; i++;){
      	                        ^
Main.java:21: error: illegal start of expression
      	for (i = 0; i < len; i++;){
      	                         ^
2 errors
Language: Java

import java.util.Scanner;
import java.util.ArrayList;
 
public class Main {
    public static void main(String[] args) {
      String strArray[];
      Scanner scan = new Scanner(System.in);
	  String str = scan.next();
      
      // 変数strの長さ分回す
      for (int i = 0; i < str.length(); i++) {
          // 配列に順番に格納する
          strArray[i] = String.valueOf(str.charAt(i));
          strArray[i] = "x";
      }
      
      String s = String.join("", strArray);
      System.out.println(s);
      
    }
}

Compiler output:
Main.java:13: error: variable strArray might not have been initialized
          strArray[i] = String.valueOf(str.charAt(i));
          ^
Main.java:17: error: variable strArray might not have been initialized
      String s = String.join("", strArray);
                                 ^
2 errors
Language: C++

#include <iostream>
#include <cstdio>
#include <string>
#include <cctype>
#include <algorithm>

#define ll long long

using namespace std;

inline int read(){
	int x=0,f=1;
	char ch=getchar();
	while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}
	while (isdigit(ch)) x=x*10+ch-'0',ch=getchar();
	return x*f;
}

int main(){
	string s;
	getline(cin,s);
	for (int i=0;i<s.length();i++){
		if (s[i]>='a'&&s[i]<='z'){
			cout<<"x";
		}
		else if (s[i]>='A'&&s[i]<='Z')
		else cout<<s[i];
	}
	cout<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:17: error: expected primary-expression before 'else'
   27 |                 else cout<<s[i];
      |                 ^~~~
Language: C++

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


Compiler output:
a.cc:2:9: fatal error: stirng.h: No such file or directory
    2 | #include<stirng.h>
      |         ^~~~~~~~~~
compilation terminated.
Language: C++


import java.util.Scanner;
import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
      String strArray[];
      Scanner scan = new Scanner(System.in);
	  String str = scan.next();
      
      // 変数strの長さ分回す
      for (int i = 0; i < str.length(); i++) {
          // 配列に順番に格納する
          strArray[i] = String.valueOf(str.charAt(i));
          strArray[i] = "x";
      }
      
      String s = String.join("", strArray);
      System.out.println(s);
      
    }
}

Compiler output:
a.cc:2:1: error: 'import' does not name a type
    2 | import java.util.Scanner;
      | ^~~~~~
a.cc:2:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:3:1: error: 'import' does not name a type
    3 | import java.util.ArrayList;
      | ^~~~~~
a.cc:3:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:5:1: error: expected unqualified-id before 'public'
    5 | public class Main {
      | ^~~~~~
Language: C++

#include <iostream>
#include <string>
#include <algorithm>
#include <cctype>
using namespace std;

int main(){
  string S;
  cin >> S;
  
  S_num = (int)(S.length());
  
  string str(S_num, 'x');
  cout << str << endl;
  return 0;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:11:3: error: 'S_num' was not declared in this scope
   11 |   S_num = (int)(S.length());
      |   ^~~~~
Language: C++

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
	char s[110];int l;
	gets(s);l=strlen(s);
	for(int i=0;i<l;++i)
	s[i]='x';s[l]='\n';
	puts(s);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    8 |         gets(s);l=strlen(s);
      |         ^~~~
      |         getw
Language: C

#include<stdio.h>
#include<string.h>
#include<stdib.h>
int main()
{
  int i;
 	char a[100];
  for (i=0;i<strlen(a);i++)
    a[i]='x';
  printf("%s",a);
}

Compiler output:
main.c:3:9: fatal error: stdib.h: No such file or directory
    3 | #include<stdib.h>
      |         ^~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <string>

using namespace std;

int main(){
    char s[1000],t[1000];
    int a,b;
    char u[1000];

    cin>>s;
    int len=strlen(s);
    char x[1000];
    for(int i=0;i<len;i++)
        x[i]+='x';
    cout<<x<<endl;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:13: error: 'strlen' was not declared in this scope
   12 |     int len=strlen(s);
      |             ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include <iostream>
  +++ |+#include <cstring>
    2 | #include <string>
Language: C++

#include<stdio.h>
int main()
{
    int i;
char a1[];
//char x;

scanf("%c",&a1);

for(i=0;i>=a1[i];i++)
{
if(a1[i]=!x)
a1[i]=x;
}
printf("%d",a[1]);
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:6: error: storage size of 'a1' isn't known
    5 | char a1[];
      |      ^~
a.cc:12:11: error: 'x' was not declared in this scope
   12 | if(a1[i]=!x)
      |           ^
a.cc:15:13: error: 'a' was not declared in this scope
   15 | printf("%d",a[1]);
      |             ^
Language: C++

#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std;
int main()
{
    char s[105];
    scanf("%s",s);
    l=strlen(s);
    for(int i=0;i<l;i++)
    printf("x");
    printf("\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: 'l' was not declared in this scope
    9 |     l=strlen(s);
      |     ^
Language: C++

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

int main(){
  string S;
  cin >> S;
  int i=0;
  while(1){
    if(i==length(S)){
      break;
    }
    S[i]='x';
  }
  cout << S << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: 'length' was not declared in this scope
   10 |     if(i==length(S)){
      |           ^~~~~~
Language: Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
      String strArray[];
      Scanner scan = new Scanner(System.in);
	  String str = scan.next();
      
      // 変数strの長さ分回す
      for (int i = 0; i < str.length(); i++) {
          // 配列に順番に格納する
          strArray[i] = String.valueOf(str.charAt(i));
          strArray[i] = "x";
      }
      
      String s = String.join("", strArray);
      System.out.println(s);
      
    }
}

Compiler output:
Main.java:12: error: variable strArray might not have been initialized
          strArray[i] = String.valueOf(str.charAt(i));
          ^
Main.java:16: error: variable strArray might not have been initialized
      String s = String.join("", strArray);
                                 ^
2 errors
Language: C++

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

	cin >> s;

	for (int i = 0; i < s.size(); i++) {
		if (s.at[i] != "x") {
			s.at[i] = "x";
		}
	}

	cout << s;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:25: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   12 |                 if (s.at[i] != "x") {
      |                         ^
a.cc:13:29: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   13 |                         s.at[i] = "x";
      |                             ^
Language: Java

import java.util.Scanner;

public class HelloWorld {
    public static void main(String[] args) {
      String strArray[];
      Scanner scan = new Scanner(System.in);
	  String str = scan.next();
      
      // 変数strの長さ分回す
      for (int i = 0; i < str.length(); i++) {
          // 配列に順番に格納する
          strArray[i] = String.valueOf(str.charAt(i));
          strArray[i] = "x";
      }
      
      String s = String.join("", strArray);
      System.out.println(s);
      
    }
}

Compiler output:
Main.java:3: error: class HelloWorld is public, should be declared in a file named HelloWorld.java
public class HelloWorld {
       ^
1 error
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:9:17: error: 's' was not declared in this scope
    9 |   for(int i=0;i<s.length();i++)
      |                 ^
Language: C++

#include<iostream>
using namespace std;
int main()
{
  string s, out;
  cin >> s;
  int char_size = s.size();
  for (char_size > 0, char_size--) {
    out = out + "x";
  }
  cout << out << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:34: error: expected ';' before ')' token
    8 |   for (char_size > 0, char_size--) {
      |                                  ^
      |                                  ;
a.cc:12:3: error: expected primary-expression before 'return'
   12 |   return 0;
      |   ^~~~~~
a.cc:11:23: error: expected ')' before 'return'
   11 |   cout << out << endl;
      |                       ^
      |                       )
   12 |   return 0;
      |   ~~~~~~               
a.cc:8:7: note: to match this '('
    8 |   for (char_size > 0, char_size--) {
      |       ^
Language: Java

import java.util.Scanner;

public class Contest2 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		String res = "";
		int n = str.length();
		for(int i=0;i<n;i++) {
			res+="x";

		}
		System.out.println(res);
		


	}

}


Compiler output:
Main.java:3: error: class Contest2 is public, should be declared in a file named Contest2.java
public class Contest2 {
       ^
1 error
Language: Java

import java.util.*;

class Main{
  public static void man(String[] args){
    Scanner sc=new Scanner(System.in);
    String ss=sc.next();
    
    for(int i=0;i<ss.length;i++){
      System.out.print('x');
    }
  }
}


Compiler output:
Main.java:8: error: cannot find symbol
    for(int i=0;i<ss.length;i++){
                    ^
  symbol:   variable length
  location: variable ss of type String
1 error
Language: C++

#include<iostream>
#include<cstring>
using namespace std;
int main()
{
	char s[110];int l;
	gets(s);l=strlen(s);
	for(int i=0;i<l;++i)
	s[i]='x';s[l]='\n';
	puts(s);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |         gets(s);l=strlen(s);
      |         ^~~~
      |         getw
Language: C++

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

int main()
{
  char c;
  int len;
  while(cin>>c)
  	cout<<'x';
  return cout<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:14: error: cannot convert 'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} to 'int' in return
   10 |   return cout<<endl;
      |          ~~~~^~~~~~
      |              |
      |              std::basic_ostream<char>::__ostream_type {aka std::basic_ostream<char>}
Language: C++

#include<cstdio>
#include<string>
using namespace std;

int main(){
  int len;
  char s[100];

  scanf("%s", s);

  len = strlen(s);

  for(int i = 0; i < len; i++){
    printf("x"); 
  }
  printf("\n");

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: 'strlen' was not declared in this scope
   11 |   len = strlen(s);
      |         ^~~~~~
a.cc:3:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    2 | #include<string>
  +++ |+#include <cstring>
    3 | using namespace std;
Language: C++

#include <iostream>
#include <vector>
#include <string>
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:10:22: error: 'strlen' was not declared in this scope
   10 |   for(int i = 0; i < strlen(s); i++){
      |                      ^~~~~~
a.cc:3:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    2 | #include <vector>
  +++ |+#include <cstring>
    3 | #include <string>
Language: C++

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

int main() {
  string s;
  cin >> s;
  string 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:9:13: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    9 |     S.at(i) == "x";
      |     ~~~~~~~~^~~~~~
Language: Java

import java.util.Scanner;

public class HelloWorld {
    public static void main(String[] args) {
      Scanner scan = new Scanner(System.in);
	  String str = scan.next();
      
      // 変数strの長さ分回す
      for (int i = 0; i < str.length(); i++) {
          // 配列に順番に格納する
          strArray[i] = String.valueOf(str.charAt(i));
          strArray[i] = "x";
      }
      
      String s = String.join("", strArray);
      System.out.println(s);
      
    }
}

Compiler output:
Main.java:3: error: class HelloWorld is public, should be declared in a file named HelloWorld.java
public class HelloWorld {
       ^
Main.java:11: error: cannot find symbol
          strArray[i] = String.valueOf(str.charAt(i));
          ^
  symbol:   variable strArray
  location: class HelloWorld
Main.java:12: error: cannot find symbol
          strArray[i] = "x";
          ^
  symbol:   variable strArray
  location: class HelloWorld
Main.java:15: error: cannot find symbol
      String s = String.join("", strArray);
                                 ^
  symbol:   variable strArray
  location: class HelloWorld
4 errors
Language: C++

#include<iostream>
using namespace std;
int main()
{
  string s;
  cin >> s;
  
  string out;
  
  int c_size = s.size();
  
  for (c_size > 0, c_size--) {
    out = out + "x";
  }
  
  cout << out << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:28: error: expected ';' before ')' token
   12 |   for (c_size > 0, c_size--) {
      |                            ^
      |                            ;
a.cc:17:3: error: expected primary-expression before 'return'
   17 |   return 0;
      |   ^~~~~~
a.cc:16:23: error: expected ')' before 'return'
   16 |   cout << out << endl;
      |                       ^
      |                       )
   17 |   return 0;
      |   ~~~~~~               
a.cc:12:7: note: to match this '('
   12 |   for (c_size > 0, c_size--) {
      |       ^
Language: C++

#include <iostream>
using namespace std;


int main(){
    string str;

    cin >> str;

    for (int i=0; i<str.length(); i++){
        str[i]="x";
    }

    cout << str <<endl;
    return 0;
}



    // string str;

    // cin >> str;

    // for (int i=0; i<str.length(); i++){
    //     str[i]=x
    // }

    // cout << str <<endl;
    // return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:16: error: invalid conversion from 'const char*' to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} [-fpermissive]
   11 |         str[i]="x";
      |                ^~~
      |                |
      |                const char*
a.cc: At global scope:
a.cc:31:1: error: expected declaration before '}' token
   31 | }
      | ^
Language: C++

#include <vector>
#include <bits/stdc++.h>
#include <iomanip>
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 |     }
      |     ~
Language: C++

#include<iostream>
#include<cstring>
using namespace std;
int main()
{
	char s[100];int l;
	gets(s);l=strlen(s);
	for(int i=0;i<l;++i)
	s[i]='x';
	puts(s);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |         gets(s);l=strlen(s);
      |         ^~~~
      |         getw