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

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
  int n;
  cin>>n;
  for(int i=0;i<n;i++){
    double a,b,c;
    scanf("%f,%f,%f",&a,&b,&c);
    if((b)/(c*c)>=25)
      cout<<s<<endl;
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 's' was not declared in this scope
   11 |       cout<<s<<endl;
      |             ^
Language: C++

#include <iostream>
#include <algorithm>
using namespace std;
int main(){
	int s;
	double w,h;
	while(cin>>s>>w>>h){
		if(w/h/h>=25)cout<<w<<<endl;
		}
    return 0;
    }


Compiler output:
a.cc: In function 'int main()':
a.cc:8:39: error: expected primary-expression before '<' token
    8 |                 if(w/h/h>=25)cout<<w<<<endl;
      |                                       ^
Language: C++

include <iostream>
using namespace std;
int main() 
{
    int s;
    double w, h, BMI;
    while(scanf("%lf %lf %lf", s, w, h) != EOF) {
        BMI = w / h / h;
        if (BMI >= 25)
            cout << s << endl;
    }
    return 0;
}


Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <iostream>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:7:11: error: 'scanf' was not declared in this scope
    7 |     while(scanf("%lf %lf %lf", s, w, h) != EOF) {
      |           ^~~~~
a.cc:7:44: error: 'EOF' was not declared in this scope
    7 |     while(scanf("%lf %lf %lf", s, w, h) != EOF) {
      |                                            ^~~
a.cc:1:1: note: 'EOF' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | include <iostream>
a.cc:10:13: error: 'cout' was not declared in this scope
   10 |             cout << s << endl;
      |             ^~~~
a.cc:10:26: error: 'endl' was not declared in this scope
   10 |             cout << s << endl;
      |                          ^~~~
Language: C++

#include <iostream>
#include <string>
#include <vector>

using namespace std;

vector<string> split(string s, char delim = ',');
void dataInput(vector<vector<string>> &data);
double calcBMI(double w, double h);
void showFat(vector<vector<string>> data);

int main() {
  vector<vector<string>> data;

  dataInput(data);

  return 0;
}

vector<string> split(string s, char delim) {
	size_t pos = 0;
	vector<string> ret;
	while ((pos = s.find(delim)) != string::npos) {
		ret.push_back(s.substr(0, pos));
		s.erase(0, pos + 1);
	};
	ret.push_back(s);
	return ret;
}

void dataInput(vector<vector<string>> &data) {
  int i = 0;
  string temp;
  while(!cin.eof()) {
    cin >> temp;
    data[i].pushback(split(temp));

    i++;
  }

}

double calcBMI(double w, double h) {
  double BMI = 0.0;

  BMI = w / (h * h);

  return BMI
}

void showFat(vector<vector<string>> data) {
  int cnt = 0;

  while(cnt < data.size()) {
    if(25.0 <= calcBMI(data[cnt][1],data[cnt][2])) {
      cout << data[cnt][0] << "\n";
    }
  }
}


Compiler output:
a.cc: In function 'void dataInput(std::vector<std::vector<std::__cxx11::basic_string<char> > >&)':
a.cc:36:13: error: '__gnu_cxx::__alloc_traits<std::allocator<std::vector<std::__cxx11::basic_string<char> > >, std::vector<std::__cxx11::basic_string<char> > >::value_type' {aka 'class std::vector<std::__cxx11::basic_string<char> >'} has no member named 'pushback'; did you mean 'push_back'?
   36 |     data[i].pushback(split(temp));
      |             ^~~~~~~~
      |             push_back
a.cc: In function 'double calcBMI(double, double)':
a.cc:48:13: error: expected ';' before '}' token
   48 |   return BMI
      |             ^
      |             ;
   49 | }
      | ~            
a.cc: In function 'void showFat(std::vector<std::vector<std::__cxx11::basic_string<char> > >)':
a.cc:55:23: error: cannot convert '__gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type' {aka 'std::__cxx11::basic_string<char>'} to 'double'
   55 |     if(25.0 <= calcBMI(data[cnt][1],data[cnt][2])) {
      |                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                       |
      |                       __gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type {aka std::__cxx11::basic_string<char>}
a.cc:43:23: note:   initializing argument 1 of 'double calcBMI(double, double)'
   43 | double calcBMI(double w, double h) {
      |                ~~~~~~~^
Language: C++

#include <iostream>
#include <string>
#include <vector>

using namespace std;

vector<string> split(string s, char delim = ',');
void dataInput(vector<vector<string> > &data);
double calcBMI(double w, double h);
void showFat(vector<vector<string> > data);

int main() {
  vector<vector<string> > data;

  dataInput(data);

  return 0;
}

vector<string> split(string s, char delim) {
	size_t pos = 0;
	vector<string> ret;
	while ((pos = s.find(delim)) != string::npos) {
		ret.push_back(s.substr(0, pos));
		s.erase(0, pos + 1);
	};
	ret.push_back(s);
	return ret;
}

void dataInput(vector<vector<string> > &data) {
  int i = 0;
  string temp;
  while(!cin.eof()) {
    cin >> temp;
    data[i].pushback(split(temp));

    i++;
  }

}

double calcBMI(double w, double h) {
  double BMI = 0.0;

  BMI = w / (h * h);

  return BMI
}

void showFat(vector<vector<string> > data) {
  int cnt = 0;
  double w = 0.0;
  double h = 0.0;

  while(cnt < data.size()) {
    w = stod(data[cnt][1]);
    h = stod(data[cnt][2]);
    if(25.0 <= calcBMI(w,h) {
      cout << data[cnt][0] << "\n";
    }
  }
}


Compiler output:
a.cc: In function 'void dataInput(std::vector<std::vector<std::__cxx11::basic_string<char> > >&)':
a.cc:36:13: error: '__gnu_cxx::__alloc_traits<std::allocator<std::vector<std::__cxx11::basic_string<char> > >, std::vector<std::__cxx11::basic_string<char> > >::value_type' {aka 'class std::vector<std::__cxx11::basic_string<char> >'} has no member named 'pushback'; did you mean 'push_back'?
   36 |     data[i].pushback(split(temp));
      |             ^~~~~~~~
      |             push_back
a.cc: In function 'double calcBMI(double, double)':
a.cc:48:13: error: expected ';' before '}' token
   48 |   return BMI
      |             ^
      |             ;
   49 | }
      | ~            
a.cc: In function 'void showFat(std::vector<std::vector<std::__cxx11::basic_string<char> > >)':
a.cc:59:28: error: expected ')' before '{' token
   59 |     if(25.0 <= calcBMI(w,h) {
      |       ~                    ^~
      |                            )
a.cc:62:3: error: expected primary-expression before '}' token
   62 |   }
      |   ^
Language: C++

main(id){double w,h,bmi;for(;~scanf("%d,%lf,%lf",&id,&w,&h);)w/h/h>=25&&printf("%d\n",id);exit(0);}

Compiler output:
a.cc:1:5: error: expected constructor, destructor, or type conversion before '(' token
    1 | main(id){double w,h,bmi;for(;~scanf("%d,%lf,%lf",&id,&w,&h);)w/h/h>=25&&printf("%d\n",id);exit(0);}
      |     ^
Language: C++

float w,h;main(n,a){for(;~scanf("%[^,],%f,%f ",a,&w,&h);)w<24*h*h||puts(a);}

Compiler output:
a.cc:1:15: error: expected constructor, destructor, or type conversion before '(' token
    1 | float w,h;main(n,a){for(;~scanf("%[^,],%f,%f ",a,&w,&h);)w<24*h*h||puts(a);}
      |               ^
Language: C++

#include <cstdio>
int main(){
	int i;
	double w,t;

	while( ~scanf("%d,%lf,%lf", &i , &w , &t ) ){
		if( w/t/t >= 25.0 )
			printf("%d\n", No );
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:40: error: 'No' was not declared in this scope
    8 |                         printf("%d\n", No );
      |                                        ^~
Language: C++

main(n){double w,t;for(;~scanf("%d,%lf,%lf",&n,&w,&t);w/t/t>25.0?printf("%d\n", n ):0);}

Compiler output:
a.cc:1:5: error: expected constructor, destructor, or type conversion before '(' token
    1 | main(n){double w,t;for(;~scanf("%d,%lf,%lf",&n,&w,&t);w/t/t>25.0?printf("%d\n", n ):0);}
      |     ^
Language: C++

main(n){double w,t;for(;~scanf("%d,%f,%f",&n,&w,&t);w/t/t>=25?printf("%d\n",n):0);}

Compiler output:
a.cc:1:5: error: expected constructor, destructor, or type conversion before '(' token
    1 | main(n){double w,t;for(;~scanf("%d,%f,%f",&n,&w,&t);w/t/t>=25?printf("%d\n",n):0);}
      |     ^
Language: C++

#include <cstdio>
#include <vector>
using namespace std;
const double BMI_FAT = 25.0;

int main(int argc, char *argv[]) {
	vector<int> fat_list;
	
	int id;
	float mass, height;
	while (EOF != fscanf(stdin, "%d,%f,%f", &id, &mass, &height)) {
		float bmi = mass / (height * height);
		if (BMI_FAT =< bmi) {
			fat_list.push_back(id);
		}
	}
	// print
	const int list_size = static_cast<int>(fat_list.size());
	if (list_size > 0) {
		for (int i = 0; i < list_size; i++) {
			printf("%d\n", fat_list[i]);
		}
	}
	else {
		puts("ツ該ツ督鳴づ按つオ");
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main(int, char**)':
a.cc:13:30: error: expected primary-expression before '<' token
   13 |                 if (BMI_FAT =< bmi) {
      |                              ^
Language: C++

float h,w,k;main(i){for(;~scanf("%d%c%f%c%f",&i,&k,&w,&k,&h);25*h*h>w?:printf("%d\n",i));}

Compiler output:
a.cc:1:17: error: expected constructor, destructor, or type conversion before '(' token
    1 | float h,w,k;main(i){for(;~scanf("%d%c%f%c%f",&i,&k,&w,&k,&h);25*h*h>w?:printf("%d\n",i));}
      |                 ^
Language: C++

#include <iostream>


using namespace std;
int num,i=0;
double m,kg;
int main(void){
	while(~scanf("%d,%lf,%lf",&num,&kg,&m)){
		if(kg/(pow(m,2))>=25)printf("%d\n",num);
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:24: error: 'pow' was not declared in this scope
    9 |                 if(kg/(pow(m,2))>=25)printf("%d\n",num);
      |                        ^~~
Language: C++

main(){int x,sum=0;double a,b;while(scanf("%d,%lf,%lf",&x,&a,&b)!=EOF){double y=a/b;y/=b;if(y>=25)printf("%d\n",x);}return 0;}

Compiler output:
a.cc:1:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    1 | main(){int x,sum=0;double a,b;while(scanf("%d,%lf,%lf",&x,&a,&b)!=EOF){double y=a/b;y/=b;if(y>=25)printf("%d\n",x);}return 0;}
      | ^~~~
a.cc: In function 'int main()':
a.cc:1:37: error: 'scanf' was not declared in this scope
    1 | main(){int x,sum=0;double a,b;while(scanf("%d,%lf,%lf",&x,&a,&b)!=EOF){double y=a/b;y/=b;if(y>=25)printf("%d\n",x);}return 0;}
      |                                     ^~~~~
a.cc:1:67: error: 'EOF' was not declared in this scope
    1 | main(){int x,sum=0;double a,b;while(scanf("%d,%lf,%lf",&x,&a,&b)!=EOF){double y=a/b;y/=b;if(y>=25)printf("%d\n",x);}return 0;}
      |                                                                   ^~~
a.cc:1:1: note: 'EOF' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | main(){int x,sum=0;double a,b;while(scanf("%d,%lf,%lf",&x,&a,&b)!=EOF){double y=a/b;y/=b;if(y>=25)printf("%d\n",x);}return 0;}
a.cc:1:99: error: 'printf' was not declared in this scope
    1 | main(){int x,sum=0;double a,b;while(scanf("%d,%lf,%lf",&x,&a,&b)!=EOF){double y=a/b;y/=b;if(y>=25)printf("%d\n",x);}return 0;}
      |                                                                                                   ^~~~~~
a.cc:1:99: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
Language: C++

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

int main(){

  double x,y;
  int n;

  while(scanf("%d,%lf,%lf",&n,&x,&y) != EOF){

    if(x/(y*y) >= 25) cout << n << endl;

  }

}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include<iostream>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:12:23: error: 'cout' was not declared in this scope
   12 |     if(x/(y*y) >= 25) cout << n << endl;
      |                       ^~~~
a.cc:3:1: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    2 | #include<cstdio>
  +++ |+#include <iostream>
    3 | using namespace std;
a.cc:12:36: error: 'endl' was not declared in this scope
   12 |     if(x/(y*y) >= 25) cout << n << endl;
      |                                    ^~~~
a.cc:3:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    2 | #include<cstdio>
  +++ |+#include <ostream>
    3 | using namespace std;
Language: C++

#include <cstdio>
#include <iostream>
#include <vector>

using namespace std;

int main() {
	vector<int> ans;
	int a;
	double b,c;
	while(scanf("%d,%f,%f",a,b,c)){
		if(c/(b*b) >= 25) ans.push_back(a)
	}
	for(int i=0; i<ans.size(); i++){
		cout<<ans[i]<<endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:51: error: expected ';' before '}' token
   12 |                 if(c/(b*b) >= 25) ans.push_back(a)
      |                                                   ^
      |                                                   ;
   13 |         }
      |         ~
Language: C++

#include<iostream>
using namespace std;
int man(){
  int np;
  double w,h;
  while(cin>>np>>w>>h) if(w/(h*h)>=25) cout << np << endl;
  return 0;
}

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: Java

import java.util.Scanner;

//Treasure Hunt II
public class AOJ0076 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		while(true){
			int n = sc.nextInt();
			if(n==-1)break;
			double x = 1;
			double y = 0;
			for(int i=2;i<=n;i++){
				double d = Math.sqrt(x*x+y*y);
				double dx = -y/d;
				double dy = x/d;
				x+=dx;
				y+=dy;
			}
			System.out.printf("%.2f\n%.2f\n", x, y);
		}
	}
}

Compiler output:
Main.java:4: error: class AOJ0076 is public, should be declared in a file named AOJ0076.java
public class AOJ0076 {
       ^
1 error
Language: C++

def f(x,y):
    d=(x*x+y*y)**0.5
    return -y/d,x/d
while True:
    n=input()
    if n==-1:
        break
    x,y=1.0,0
    for i in xrange(n-1):
        dx,dy=f(x,y)
        x,y=x+dx,y+dy
    print x,y

Compiler output:
a.cc:1:1: error: 'def' does not name a type
    1 | def f(x,y):
      | ^~~
Language: C++

#include <iomanip>
#include <iostream>

#define VARIABLE(x) cerr << #x << "=" << x << endl
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define REP(i,m,n) for (int i=m;i<(int)(n);i++)

const int INF = 10000000;
using namespace std;
typedef long long  ll;

/** Problem0076 : Treasure Hunt II **/
int main()
{
	int n;
	while (cin>>n, n>0) {
		double x, y;
		x=1.0; y=0.0;
		REP(i, 1, n) {
			double nx = -y;
			double ny = x;
			double dx = nx/sqrt(nx*nx+ny*ny);
			double dy = ny/sqrt(nx*nx+ny*ny);
			x = x+dx; y = y+dy;
		}
		cout << fixed << setprecision(2) << x << "\n" << y << endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:40: error: 'sqrt' was not declared in this scope
   22 |                         double dx = nx/sqrt(nx*nx+ny*ny);
      |                                        ^~~~
Language: Java

import java.io.BufferedReader;
import java.io.InputStreamReader;


public class V0077{
	public static void main (String[] args) throws java.lang.Exception
	{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		while(true){
			String str = br.readLine();
			for(int i = 0;i<str.length();i++){
				if(str.charAt(i)!='@'){
					System.out.print(str.charAt(i));
				}
				else{
					int n= Character.getNumericValue(str.charAt(i+1));
					for(int j = 0; j<n ; j ++){
						System.out.print(str.charAt(i+2));
					}
					i+=2;
				}
			}
			System.out.println("");
			}
	}
}

Compiler output:
Main.java:5: error: class V0077 is public, should be declared in a file named V0077.java
public class V0077{
       ^
1 error
Language: Java

mport java.util.Scanner;

//Run Length
public class AOJ0077 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		while(sc.hasNext()){
			char[] s = sc.next().toCharArray();
			StringBuilder sb = new StringBuilder();
			int i = 0;
			while(i<s.length){
				if(s[i]=='@'){
					int x = s[++i]-'0';
					i++;
					while(x--!=0)sb.append(s[i]);
				}
				else sb.append(s[i]);
				i++;
			}
			System.out.println(sb);
		}
	}
}

Compiler output:
Main.java:1: error: class, interface, enum, or record expected
mport java.util.Scanner;
^
1 error
Language: Java

mport java.util.Scanner;

//Run Length
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		while(sc.hasNext()){
			char[] s = sc.next().toCharArray();
			StringBuilder sb = new StringBuilder();
			int i = 0;
			while(i<s.length){
				if(s[i]=='@'){
					int x = s[++i]-'0';
					i++;
					while(x--!=0)sb.append(s[i]);
				}
				else sb.append(s[i]);
				i++;
			}
			System.out.println(sb);
		}
	}
}

Compiler output:
Main.java:1: error: class, interface, enum, or record expected
mport java.util.Scanner;
^
1 error
Language: Java

package jp.ac.can;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class RLE{
  public static void main(String[] args) throws IOException{
    BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
    
    String line = read.readLine();
    String ans = "";
    
    int i = 0;
    while(i < line.length()){
    int count = 1;
    // ????????????????????? ?????? count?????°?????????????????¨??????
    while(i + count < line.length() && line.charAt(i) == line.charAt(i + count)){
      ++count; // ??£?¶???°???????????????
    }
    
    if(count >= 4){
      // 4 ?????\?????£?¶?????????????
      ans += line.charAt(i) + count;
    } else {
      // 3 ?????\???
      for(int j = 0; j < count; ++j){
        ans += line.charAt(i);
      }
    }
    // ?¬???????????????????
    i += count;
    }
    System.out.println(ans);
  }
}

Compiler output:
Main.java:6: error: class RLE is public, should be declared in a file named RLE.java
public class RLE{
       ^
1 error
Language: C

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

int i,j,k,l;
char nyuroku[114514],m;

int main(int argc,char **argv){
  while( scanf("%s",&nyuroku[0]) != EOF ) 
    {
      printf("debug = %s\n",nyuuroku);
      l = strlen(nyuroku);
      for(i=0;i<l;i++)
	{
	  if( nyuroku[i] != '@' )
	    {
	      printf("%c",nyuroku[i]);
	    }
	  else
	    {
	      for(m='0';m<nyuroku[i+1];m++)
		{
		  printf("%c",nyuroku[i+2]);
		}
	    }
	}
      puts("");
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:10:29: error: 'nyuuroku' undeclared (first use in this function); did you mean 'nyuroku'?
   10 |       printf("debug = %s\n",nyuuroku);
      |                             ^~~~~~~~
      |                             nyuroku
main.c:10:29: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
#include <string.h>
#define LENGTH 1000

int ctoi(char input)
{
  int i;
  i = input - '0';
  return i;
}

int main()
{
  char st[LENGTH] = {};
  char output_st[LENGTH] = {};
  int i = 0, j = 0, k = 0;

  for( k = 0 ; k < 50 ; k++ )
  {
    if( (scanf("%s", st)) != EOF )
    {
      i = 0;
      while( st[i] != '\0' )
      {
        if( st[i] == '@' )
        {
          i++;
          j = ctoi(st[i]);
          i++;
          for( ; j > 0 ; j-- )
            sprintf(output_st, "%s%c", output_st, st[i]);
        }

        else
          sprintf(output_st, "%s%c", output_st, st[i]);
        i++;
      }
      printf("%s\n", output_st);
      memset(output_st, '\0', LENGTH);
    }
    else
      return 0;
  }
  r
}



Compiler output:
main.c: In function 'main':
main.c:44:3: error: 'r' undeclared (first use in this function)
   44 |   r
      |   ^
main.c:44:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:44:4: error: expected ';' before '}' token
   44 |   r
      |    ^
      |    ;
   45 | }
      | ~
Language: C

main(i,j){
	char s[256];
	for(;gets(s);){
		for(i=0;s[i];i++){
			if(s[i]=='@'){
				for(j=0;j<s[i+1]-'0';j++)putchar(s[i+2]);
				i++;
			}
			else	putchar(s[i]);
		}
		puts("");
	}
	exit(0);
}

Compiler output:
main.c:1:1: error: return type defaults to 'int' [-Wimplicit-int]
    1 | main(i,j){
      | ^~~~
main.c: In function 'main':
main.c:1:1: error: type of 'i' defaults to 'int' [-Wimplicit-int]
main.c:1:1: error: type of 'j' defaults to 'int' [-Wimplicit-int]
main.c:3:14: error: implicit declaration of function 'gets' [-Wimplicit-function-declaration]
    3 |         for(;gets(s);){
      |              ^~~~
main.c:6:58: error: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]
    6 |                                 for(j=0;j<s[i+1]-'0';j++)putchar(s[i+2]);
      |                                                          ^~~~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'putchar'
  +++ |+#include <stdio.h>
    1 | main(i,j){
main.c:11:17: error: implicit declaration of function 'puts' [-Wimplicit-function-declaration]
   11 |                 puts("");
      |                 ^~~~
main.c:11:17: note: include '<stdio.h>' or provide a declaration of 'puts'
main.c:13:9: error: implicit declaration of function 'exit' [-Wimplicit-function-declaration]
   13 |         exit(0);
      |         ^~~~
main.c:1:1: note: include '<stdlib.h>' or provide a declaration of 'exit'
  +++ |+#include <stdlib.h>
    1 | main(i,j){
main.c:13:9: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
   13 |         exit(0);
      |         ^~~~
main.c:13:9: note: include '<stdlib.h>' or provide a declaration of 'exit'
Language: C

#include <stdio.h>#include <stdlib.h> int main(void){    int i,j,k;    char word[100],output[1000],loopWord[2],tmpWord;    int loop;         while(scanf("%s",word)!=EOF)    {        i=0;        j=0;        while(word[i]!='0')        {            //@があったら            if(word[i]=='@')            {                //次の文字を見て繰り返す回数を見る                i++;                loopWord[0]=word[i];                loop=atoi(loopWord);                //printf("%d回\n",loop);                //更に次の文字を見て繰り返される文字を見る                i++;                tmpWord=word[i];                for(k=1;k<loop;k++)                {                    output[j]=tmpWord;                    j++;                }            }            //それ以外の時            else            {                output[j]=word[i];                i++;                j++;            }        }        output[j]='\0';        printf("%s\n",output);    }         return 0;}

Compiler output:
main.c:1:19: warning: extra tokens at end of #include directive
    1 | #include <stdio.h>#include <stdlib.h> int main(void){    int i,j,k;    char word[100],output[1000],loopWord[2],tmpWord;    int loop;         while(scanf("%s",word)!=EOF)    {        i=0;        j=0;        while(word[i]!='0')        {            //@があったら            if(word[i]=='@')            {                //次の文字を見て繰り返す回数を見る                i++;                loopWord[0]=word[i];                loop=atoi(loopWord);                //printf("%d回\n",loop);                //更に次の文字を見て繰り返される文字を見る                i++;                tmpWord=word[i];                for(k=1;k<loop;k++)                {                    output[j]=tmpWord;                    j++;                }            }            //それ以外の時            else            {                output[j]=word[i];                i++;                j++;            }        }        output[j]='\0';        printf("%s\n",output);    }         return 0;}
      |                   ^
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

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

int main() {
    string s1;
    cin >> s1;
    for (int i=0;i<s1.size();++i) {
        char c = s1[i];
        string s2;
        if (c == @) {
           int d = s1[i+1];
           char e = s1[i+2];
           for (int t=0;t<d;++t){
           s2.insert(s2.end(), e);
           }
        else{
           s2.insert(s2.end(), c);
           }
    return 0;
}


Compiler output:
a.cc:11:18: error: stray '@' in program
   11 |         if (c == @) {
      |                  ^
a.cc: In function 'int main()':
a.cc:11:19: error: expected primary-expression before ')' token
   11 |         if (c == @) {
      |                   ^
a.cc:17:9: error: expected '}' before 'else'
   17 |         else{
      |         ^~~~
a.cc:11:21: note: to match this '{'
   11 |         if (c == @) {
      |                     ^
a.cc:21:2: error: expected '}' at end of input
   21 | }
      |  ^
a.cc:5:12: note: to match this '{'
    5 | int main() {
      |            ^
Language: C++

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

int main() {
    string s1;
    cin >> s1;
    string s2;
    for (int i=0;i<s1.size();++i) {
        char c = s1[i];
        if (c == @) {
           int d = s1[i+1];
           char e = s1[i+2];
           for (int t=0;t<d;++t){
           s2.insert(s2.end(), e);
           }
        else{
           s2.insert(s2.end(), c);
           }
    return 0;
}


Compiler output:
a.cc:11:18: error: stray '@' in program
   11 |         if (c == @) {
      |                  ^
a.cc: In function 'int main()':
a.cc:11:19: error: expected primary-expression before ')' token
   11 |         if (c == @) {
      |                   ^
a.cc:17:9: error: expected '}' before 'else'
   17 |         else{
      |         ^~~~
a.cc:11:21: note: to match this '{'
   11 |         if (c == @) {
      |                     ^
a.cc:21:2: error: expected '}' at end of input
   21 | }
      |  ^
a.cc:5:12: note: to match this '{'
    5 | int main() {
      |            ^
Language: C++

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

int main() {
    string s1;
    cin >> s1;
    string s2;
    for (int i=0;i<s1.size();++i) {
        char c = s1[i];
        if (c == @){
           int d = s1[i+1];
           char e = s1[i+2];
           for (int t=0;t<d;++t){
           s2.insert(s2.end(), e);
           }
           }
        else{
           s2.insert(s2.end(), c);
           }
    return 0;
}


Compiler output:
a.cc:11:18: error: stray '@' in program
   11 |         if (c == @){
      |                  ^
a.cc: In function 'int main()':
a.cc:11:19: error: expected primary-expression before ')' token
   11 |         if (c == @){
      |                   ^
a.cc:22:2: error: expected '}' at end of input
   22 | }
      |  ^
a.cc:5:12: note: to match this '{'
    5 | int main() {
      |            ^
Language: C++

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

int main() {
    string s1;
    cin >> s1;
    string s2;
    for (int i=0;i<s1.size();++i) {
        char c = s1[i];
        if (c == @){
           int d = s1[i+1];
           char e = s1[i+2];
           for (int t=0;t<d;++t){
           s2.insert(s2.end(), e);
           }
           }
        else{
           s2.insert(s2.end(), c);
           }
    }
    return 0;
}


Compiler output:
a.cc:11:18: error: stray '@' in program
   11 |         if (c == @){
      |                  ^
a.cc: In function 'int main()':
a.cc:11:19: error: expected primary-expression before ')' token
   11 |         if (c == @){
      |                   ^
Language: C++

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

int main() {
    string s1;
    cin >> s1;
    string s2;
    for (int i=0;i<s1.size();++i) {
        char c = s1[i];
        if (c == "@"){
           int d = s1[i+1];
           char e = s1[i+2];
           for (int t=0;t<d;++t){
           s2.insert(s2.end(), e);
           }
           }
        else{
           s2.insert(s2.end(), c);
           }
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   11 |         if (c == "@"){
      |             ~~^~~~~~
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main(){
  string s;
  while(cin >> s){
    while(s.find("@")!=-1){
      int x=s.find("@");
      string buf;
      for(int i=0;i<s[x+1]-"0";i++) buf+=s[x+2];
      s.replace(x,3,buf);
    }
    cout << s << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:27: error: invalid operands of types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} and 'const char [2]' to binary 'operator-'
   10 |       for(int i=0;i<s[x+1]-"0";i++) buf+=s[x+2];
Language: C++

#define scanf_s scanf
//#define gets_s gets
#include <stdio.h>
#include <string>
#include <iostream>
#include <math.h>
using namespace std;
#define MAX 101
#define _MAX 81
int main(void)
{
	char str[MAX], ans[MAX * 9];
	while (gets_s(str, MAX) != NULL) {
		for (int i = 0, j = 0; str[i - 1] != '\0'; ++i) {
			if (str[i] == '@' && str[i + 2] != '\0') {
				if ('0' <= str[i + 1] && str[i + 1] <= '9') {
					for (int k = 0; k < str[i + 1] - '0'; ++k, ++j) {
						ans[j] = str[i + 2];
					}
					i += 2;
				}
				else {
					ans[j] = str[i];
					++j;
				}
			}
			else {
				ans[j] = str[i];
				++j;
			}
		}
		printf("%s\n", ans);
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:16: error: 'gets_s' was not declared in this scope
   13 |         while (gets_s(str, MAX) != NULL) {
      |                ^~~~~~
Language: C++

#define scanf_s scanf
//#define gets_s gets
#include <stdio.h>
#include <string>
#include <iostream>
#include <math.h>
using namespace std;
#define MAX 101
#define _MAX 81
int main(void)
{
	char str[MAX];
	while (gets_s(str, MAX) != NULL) {
		for (int i = 0; str[i - 1] != '\0'; ++i) {
			if (str[i] == '@') {
				for (int j = 0; j < str[i + 1] - '0'; ++i) {
					printf("%c", str[i + 2]);
				}
				i += 2;
			}
			else {
				printf("%c", str[i]);
			}
		}
		printf("\n");
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:16: error: 'gets_s' was not declared in this scope
   13 |         while (gets_s(str, MAX) != NULL) {
      |                ^~~~~~
Language: C++

//#define scanf_s scanf
//#define gets_s gets
#include <stdio.h>
#include <string>
#include <iostream>
#include <math.h>
using namespace std;
#define MAX 101
#define _MAX 81
int main(void)
{
	char str[MAX];
	while (gets_s(str, MAX) != NULL) {
		for (int i = 0; str[i - 1] != '\0'; ++i) {
			if (str[i] == '@') {
				for (int j = 0; j < str[i + 1] - '0'; ++j) {
					printf("%c", str[i + 2]);
				}
				i += 2;
			}
			else {
				printf("%c", str[i]);
			}
		}
		printf("\n");
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:16: error: 'gets_s' was not declared in this scope
   13 |         while (gets_s(str, MAX) != NULL) {
      |                ^~~~~~
Language: C++

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


int main(){
	string s;

	while (cin >> s){
		for (auto& it = s.begin(); it != s.end(); it++){
			if (*it != '@'){
				cout << *it;
				continue;
			}
			it++;
			int n = (*it) - '0';
			it++;
			for (int i = 0; i < n; i++){
				cout << *it;
			}
		}
		cout << endl;
	}

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:40: error: cannot bind non-const lvalue reference of type '__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >&' to an rvalue of type 'std::__cxx11::basic_string<char>::iterator'
   10 |                 for (auto& it = s.begin(); it != s.end(); it++){
      |                                 ~~~~~~~^~
Language: C++

#include <iostream>
#include <string>
#include <cstdio>
using namespace std;
int main()
{
	int i, j, n;
	char c[100], b, d;
	string s;
	while (cin >> c)
	{
		if (cin.eof()) break;
		s = "";
		for (i = 0; i < strlen(c);)
		{
			if (c[i] == '@')
			{
				d = c[++i];
				n = atoi(&d);
				b = c[++i];
				for (j = 0; j < n; j++)
				{
					s += b;
				}
			}
			else
			{
				s += c[i];
			}
			i++;
		}
		cout << s << endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:33: error: 'strlen' was not declared in this scope
   14 |                 for (i = 0; i < strlen(c);)
      |                                 ^~~~~~
a.cc:4:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    3 | #include <cstdio>
  +++ |+#include <cstring>
    4 | using namespace std;
Language: C++

#include <iostream>
#include <string>
#include <cstdio>
#include <cstdlib>
using namespace std;
int main()
{
	int i, j, n;
	char c[100], b, d;
	string s;
	while (cin >> c)
	{
		if (cin.eof()) break;
		s = "";
		for (i = 0; i < strlen(c);)
		{
			if (c[i] == '@')
			{
				d = c[++i];
				n = atoi(&d);
				b = c[++i];
				for (j = 0; j < n; j++)
				{
					s += b;
				}
			}
			else
			{
				s += c[i];
			}
			i++;
		}
		cout << s << endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:33: error: 'strlen' was not declared in this scope
   15 |                 for (i = 0; i < strlen(c);)
      |                                 ^~~~~~
a.cc:5:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    4 | #include <cstdlib>
  +++ |+#include <cstring>
    5 | using namespace std;
Language: C++

#include <iostream>
#include <cstdlib>
using namespace std;
int main()
{
	int n, i, j, c;
	char s[101] = "", r[101] = "", t;
	while (cin >> s, !cin.eof())
	{
		c = 0;
		for (i = 0; i < strlen(s); i++)
		{
			if (s[i] == '@')
			{
				t = s[i+1];
				n = atoi(&t);
				for (j = 0; j < n; j++)
				{
					r[c] = s[i+2];
					c++;
				}
				i += 2;
			}
			else
			{
				r[c] = s[i];
				c++;
			}
		}
		r[c] = '\0';
		cout << r << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:33: error: 'strlen' was not declared in this scope
   11 |                 for (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 <cstdlib>
  +++ |+#include <cstring>
    3 | using namespace std;
Language: Java

&#65279;import java.util.Scanner;

public class Main {
    
    static int cnt;
    static int x, y;
    static int[][] a;
    static int n;
    
    static void pushNumber(){
	// 2. 次の数字を右斜め下のマス目に...
	x++;
	y++;

	/* 2-1. 右にはみ出した場合には、同じ行の左はしに、
	 * 左にはみ出した場合には、同じ行の右はしに、
	 * 下にはみ出した場合には、同じ列の一番上に... */
	if(x>=n){
	    x=0;
	}
	if(y>=n){
	    y=0;
	}
	if(x<0){
	    x=n-1;
	}
	if(y<0){
	    y=n-1;
	}
	if(a[x][y]==0){
	    a[x][y]=cnt++;  // 数字を入れる
	}
	else{
	    /* 数字をいれようとしたマス目が埋まっているときには、
	     * その埋まっているマス目の左斜め下のマス目に*/
	    y-=2;
	}
    }
    
    public static void main(String[] args) {
	Scanner stdIn = new Scanner(System.in);

	while(true){
	    n = stdIn.nextInt();  // Input
	    if(n==0){		  // Finish
		return;
	    }
	    a = new int[n][n];    // Box Make

	    // 1. 中央のマス目のちょうど一つ下のマス目に１をいれる。
	    x=(n-1)/2;
	    y=x++;
	    a[x][y]=1;

	    cnt = 2;
	    while(true){
		if(cnt>n*n){
		    break;
		}
		pushNumber();
	    }

	    // Output
	    for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
		    System.out.printf("%4d",a[i][j]);
		}
		System.out.println();
	    }
	}
    }
}

Compiler output:
Main.java:1: error: class, interface, enum, or record expected
&#65279;import java.util.Scanner;
^
Main.java:1: error: illegal character: '#'
&#65279;import java.util.Scanner;
 ^
Main.java:1: error: class, interface, enum, or record expected
&#65279;import java.util.Scanner;
        ^
3 errors
Language: C

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

int main(){

  int number = 0;
  int magic[100][100];
  int i;
  int j;
  int position[2] = {};
  //  int insert[100][100];
  scanf("%d", &number);

  position[0] = number - 1;
  position[1] = number/2;
  // magic[number - 1][(number/2 + 1) - 1] = 1;
  for(i = 0; i < number; i++){
    if(position[0] >= number){
      position[0] = 0;
    }
    if(position[1] >= number){
      position[1] = number -1;
    }

    magic[position[0]][position[1]] = i;
    position[0]++;
    position[1]--;
  }

  for(i = 0; i < number; i++){
    for(j = 0; j < number; j++){
      position[i][j];
    }
    printf("\n");
  }


  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:32:18: error: subscripted value is neither array nor pointer nor vector
   32 |       position[i][j];
      |                  ^
Language: C++

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

int main(){
  int n;
  while(cin >> n , n) {
    int mass[20][20]={0};
    int nowx = n / 2;
    int nowy = nowx + 1;
    int limit = n * n + 1;
    int cou = 2;
    mass[nowy][nowx] = 1;
    while(cou != limit) {
      if(mass[(nowy+1)%n][(nowx+1)%n] == 0){
	nowy = (nowy + 1) % n;
	nowx = (nowx + 1) % n;
	mass[nowy][nowx] = cou;
      }
      else {
	nowy = (nowy + 1) % n;
	nowx = (nowx + 1) % n;
	nowy = (nowy + 1) % n;
	if(nowx - 1 == -1) nowx = n - 1;
	else nowx = nowx - 1;
	mass[nowy][nowx] = cou;
      }
      cou++;
    }
    for(int i=0;i<n;i++){
      for(int j=0;j<n;j++){
	printf("%4d",mass[i][j]);
      }
      cout << endl;
    }
  }
}
    

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include<bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope
    6 |   while(cin >> n , n) {
      |         ^~~
a.cc:31:9: error: 'printf' was not declared in this scope
   31 |         printf("%4d",mass[i][j]);
      |         ^~~~~~
a.cc:1:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | include<bits/stdc++.h>
a.cc:33:7: error: 'cout' was not declared in this scope; did you mean 'cou'?
   33 |       cout << endl;
      |       ^~~~
      |       cou
a.cc:33:15: error: 'endl' was not declared in this scope
   33 |       cout << endl;
      |               ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
 
vector<vector<int>> anser;
int n;
bool input(){
  cin>>n;
  if(n == 0)return false;
  return true;
}
int main(){
  while(input()){
    solve();
    output();
  }
 
void solve(){
  int c = n/2;
  int h = n/2+1;
  anser.clear();
  anser.resize(n);
  for(int i = 0;i < n;i ++){
    anser[i].resize(n);
  }
  int count = 1;
  while(1){
    if(anser[h][c]==0){
      anser[h][c] = count;
    }else{
      h=(h+n+1)%n;
      c=(c+n-1)%n;
      anser[h][c] = count;
    }
    count++;
    h=(h+n+1)%n;
    c=(c+n+1)%n;
    if(count == 1+n*n)return ;
  }
}
 
void output(){
  const auto ans = anser;
  for(int i = 0;i < ans.size(); i++){
    for(int j = 0;j < ans[i].size(); j++){
      printf("%4d",ans[i][j]);
    }cout<<endl;
  }
}
 

}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:5: error: 'solve' was not declared in this scope
   13 |     solve();
      |     ^~~~~
a.cc:14:5: error: 'output' was not declared in this scope
   14 |     output();
      |     ^~~~~~
a.cc:17:13: error: a function-definition is not allowed here before '{' token
   17 | void solve(){
      |             ^
a.cc:41:14: error: a function-definition is not allowed here before '{' token
   41 | void output(){
      |              ^
Language: C++

#include<iostream>
#include<string>
#include<vector>
#include<cstdio>
#include<queue>
#include<map>
using namespace std;

int main() {
	int a[15][15];
	int b;
	while (cin >> b, b) {
		memset(a, -1, sizeof(a));
		int x = b / 2 + 1, y = b / 2;
		a[x][y] = 1;
		for (int c = 2; c <= b * b; c++) {
			x++; y++;
			while (1) {
				if (x >= b)x -= b;
				if (y < 0)y += b;
				if (y >= b)y -= b;
				if (a[x][y] == -1) {
					a[x][y] = c;
					break;
				}
				x++; y--;
			}
		}
		for (int p = 0; p < b; p++) {
			for (int q = 0; q < b; q++) {
				cout << a[p][q] << " ";
			}
			puts("");
		}
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:17: error: 'memset' was not declared in this scope
   13 |                 memset(a, -1, sizeof(a));
      |                 ^~~~~~
a.cc:7:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    6 | #include<map>
  +++ |+#include <cstring>
    7 | using namespace std;
Language: C++

#include <stdio.h>

int main(int argc, char **argv)
{
	int n, **a, i, j, t=0;
	
	while(1){
		scanf("%d", &n);
		if(n == 0){
			break;
		}
		
		a = (int **)calloc(n, sizeof(int));
		for(i = 0; i < n; i++){
			a[i] = (int *)calloc(n, sizeof(int));
		}
		
		i = n/2+1;
		j = n/2;
		t = 1;
		while(t <= n*n){
			if(a[i][j] != 0){
				i++;
				j--;
			} else {
				a[i++][j++] = t++;
			}
			if(n == i){
				i = 0;
			}
			if(n == j){
				j = 0;
			} else if(j < 0){
				j = n-1;
			}
		}
		
		for(i = 0; i < n-1; i++){
			printf("%4d", a[i][0]);
			for(j = 1; j < n; j++){
				printf("%4d", a[i][j]);
			}
			printf("\n");
		}
		
		for(i = 0; i < n; i++){
			free(a[i]);
		}
		
		free(a);
	}
	
	return 0;
}

Compiler output:
a.cc: In function 'int main(int, char**)':
a.cc:13:29: error: 'calloc' was not declared in this scope
   13 |                 a = (int **)calloc(n, sizeof(int));
      |                             ^~~~~~
a.cc:2:1: note: 'calloc' is defined in header '<cstdlib>'; this is probably fixable by adding '#include <cstdlib>'
    1 | #include <stdio.h>
  +++ |+#include <cstdlib>
    2 | 
a.cc:47:25: error: 'free' was not declared in this scope
   47 |                         free(a[i]);
      |                         ^~~~
a.cc:47:25: note: 'free' is defined in header '<cstdlib>'; this is probably fixable by adding '#include <cstdlib>'
a.cc:50:17: error: 'free' was not declared in this scope
   50 |                 free(a);
      |                 ^~~~
a.cc:50:17: note: 'free' is defined in header '<cstdlib>'; this is probably fixable by adding '#include <cstdlib>'
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdlib>
#include <cstdio>

using namespace std;

int main(){

	int n;
	int field[16][16];
	while(cin>>n&&n!=0){
		memset(field,0,sizeof(field));
		field[(n/2)+1][n/2]=1;
		int cx=n/2;
		int cy=(n/2)+1;
		int num=2;
		int sw=0;
		while(1){
			if(sw==0){
				int ny=(cy+1)%n;
				int nx=(cx+1)%n;
				if(field[ny][nx]==0){
					field[ny][nx]=num;
					if(num==n*n)
						break;

					if(num==5){
						cout<<endl;
					}
					num++;
					cx=nx,cy=ny;
				}
				else{
					sw=1;
					cx=nx,cy=ny;
				}
			}
			else{
				int ny=(cy+1)%n;
				int nx=(cx+n-1)%n;
				if(field[ny][nx]==0){
					field[ny][nx]=num;
					if(num==n*n)
						break;
					num++;
					sw=0;
					cx=nx,cy=ny;
				}
				else{
					sw=1;
					cx=nx,cy=ny;
				}
			}

		}
		for(int i = 0; i < n; i++){
			for(int j = 0; j < n; j++){
				printf("%4d",field[i][j]);
			}
			cout<<endl;
		}
	}

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:17: error: 'memset' was not declared in this scope
   14 |                 memset(field,0,sizeof(field));
      |                 ^~~~~~
a.cc:6:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    5 | #include <cstdio>
  +++ |+#include <cstring>
    6 |
Language: C++

#include<iostream>
#include<vector>
#include<string>
#include<cstdio>
#include<cstdlib>

using namespace::std;

int main(){

  int number;
  int i, j;
  int center = 0;
  int h = 0;
  int w = 0;
  cin>>number;

  while(number != 0){
  int magic[number][number];
  memset(magic, -1, sizeof(magic));
  center = number/2;

  h = center + 1;
  w = center;
  magic[h][w] = 1;
  for(i = 2; i <= number * number; i++){
    h = (h + 1) % number;
    w = (w + 1) % number;
    if(magic[h][w] != -1){
      h = (h + 1) % number;
      w = w - 1;
      if(w == -1){
        w = w + number;
      }
    }
    magic[h][w] = i;
  }

  for(i = 0; i < number; i++){
    for(j = 0; j < number; j++){
      printf("%3d", magic[i][j]);
    }
    printf("\n");
  }


  cin>>number;
  }


  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:3: error: 'memset' was not declared in this scope
   20 |   memset(magic, -1, sizeof(magic));
      |   ^~~~~~
a.cc:6:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    5 | #include<cstdlib>
  +++ |+#include <cstring>
    6 |
Language: C++

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

int a[15][15];
int main(){
	int n;
	while(cin>>n&&n){
		memset(a,0,sizeof(a));
		int y=n/2+1,x=n/2;
		int cur=1;
		while(cur<=n*n){
			if(a[y][x]==0){
				a[y][x]=cur++;
				y++;x++;
			}else{
				y++;x--;
			}	
			if(x<0)x=n-1;
			else if(n<=x)x=0;
			if(n<=y)y=0;
		}
		for(y=0;y<n;y++){
			for(x=0;x<n;x++){
				printf(" %3d",a[y][x]);
			}
			puts("");
		}
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:17: error: 'memset' was not declared in this scope
    9 |                 memset(a,0,sizeof(a));
      |                 ^~~~~~
a.cc:3:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    2 | #include<cstdio>
  +++ |+#include <cstring>
    3 | using namespace std;
Language: C++

#include <iomanip>
#include <iostream>
#include <sstream>
#include <vector>
using namespace std;
int magic(int n){
	int c=1,x=n/2,y=x+1;
	while(1){
		A[y][x]=c;
		if(c== n*n)break;
		while(1){
			x=(x+1)%n;
			y=(y+1)%n;
			if(A[y][x]==0)break;
			x=(x+n-1)%n;
			y=(y+1)%n;
			if(A[y][x]==0)break;
		}
		c++;
	}
	return 0;
}
int main(){
	int n,i,j;
	while(cin>>n,n!=0){
		A.resize(n);
		for(i=0;i<n;i++)A[i].resize(n,0);
		magic(n);
		stringstream buf;
		for(i=0;i<n;i++){
			for(j=0;j<n;j++)buf<<setw(4)<<setfill(' ')<< A[i][j];
			cout<<buf.str()<< endl;
			buf.str("");
		}
		A.clear();
	}
}

Compiler output:
a.cc: In function 'int magic(int)':
a.cc:9:17: error: 'A' was not declared in this scope
    9 |                 A[y][x]=c;
      |                 ^
a.cc: In function 'int main()':
a.cc:26:17: error: 'A' was not declared in this scope
   26 |                 A.resize(n);
      |                 ^
Language: C

#include<math.h>

int main() {
	double x[21], y[21], ans = 0;
	int n = 0;
	while (scanf("%lf,%lf", &x[n], &y[n]) != EOF) {
		n++;
	}
	for (int i = 1; i < n; i++) {
		double s = (x[i] - x[0])*(y[i + 1] - y[0]) - (x[i + 1] - x[0])*(y[i] - y[0]);
		if (s < 0)s *= -1;
		ans += s;
	}
	printf("%.8lf", ans);
}



Compiler output:
main.c: In function 'main':
main.c:6:16: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    6 |         while (scanf("%lf,%lf", &x[n], &y[n]) != EOF) {
      |                ^~~~~
main.c:2:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
    1 | #include<math.h>
  +++ |+#include <stdio.h>
    2 | 
main.c:6:16: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    6 |         while (scanf("%lf,%lf", &x[n], &y[n]) != EOF) {
      |                ^~~~~
main.c:6:16: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:6:50: error: 'EOF' undeclared (first use in this function)
    6 |         while (scanf("%lf,%lf", &x[n], &y[n]) != EOF) {
      |                                                  ^~~
main.c:6:50: note: 'EOF' is defined in header '<stdio.h>'; this is probably fixable by adding '#include <stdio.h>'
main.c:6:50: note: each undeclared identifier is reported only once for each function it appears in
main.c:14:9: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   14 |         printf("%.8lf", ans);
      |         ^~~~~~
main.c:14:9: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:14:9: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:14:9: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C

#include <stdio.h>
#include <math.h>
int main(){
	int i,j;
    double x[20],y[20],s=0;
    //値の読み込み
    
    	for(i=0;i<20 ;i++){
    		if(scanf("%lf%lf",&x[i],&y[i]) ==EOF) break;
    		//scanf("%lf%lf",&x[i],&y[i]);
    		j=i;
    	}
        n=i-1;
    	for(i=0;i<n;i++){
    		s+=(fabs(x[i]*y[i+1]-x[i+1]*y[i])/2.0);
    	}
    	printf("%0.6lf\n",s);
    
    return 0;
}



Compiler output:
main.c: In function 'main':
main.c:13:9: error: 'n' undeclared (first use in this function)
   13 |         n=i-1;
      |         ^
main.c:13:9: note: each undeclared identifier is reported only once for each function it appears in