Language: C

#include<stdio.h>
int main(){
    int a,b;
    scanf("%d:%d",&a,%b);
    if(a<b);

    if(a>b);

    if(a==b);

    printf("%d:%d:%d\n",h,m,s);
    return 0;
}

































#include<stdio.h>
int main(){
    int a,b;
    scanf("%d:%d",&a,%b);
    if(a<b);

    if(a>b);

    if(a==b);

    printf("%d:%d:%d\n",h,m,s);
    return 0;
}


































#include<stdio.h>
int main(){
    int a,b;
    scanf("%d:%d",&a,%b);
    if(a<b);

    if(a>b);

    if(a==b);

    printf("%d:%d:%d\n",h,m,s);
    return 0;
}


































#include<stdio.h>
int main(){
    int a,b;
    scanf("%d:%d",&a,%b);
    if(a<b);

    if(a>b);

    if(a==b);

    printf("%d:%d:%d\n",h,m,s);
    return 0;
}







































Compiler output:
main.c: In function 'main':
main.c:4:22: error: expected expression before '%' token
    4 |     scanf("%d:%d",&a,%b);
      |                      ^
main.c:11:25: error: 'h' undeclared (first use in this function)
   11 |     printf("%d:%d:%d\n",h,m,s);
      |                         ^
main.c:11:25: note: each undeclared identifier is reported only once for each function it appears in
main.c:11:27: error: 'm' undeclared (first use in this function)
   11 |     printf("%d:%d:%d\n",h,m,s);
      |                           ^
main.c:11:29: error: 's' undeclared (first use in this function)
   11 |     printf("%d:%d:%d\n",h,m,s);
      |                             ^
main.c: At top level:
main.c:48:5: error: redefinition of 'main'
   48 | int main(){
      |     ^~~~
main.c:2:5: note: previous definition of 'main' with type 'int()'
    2 | int main(){
      |     ^~~~
main.c: In function 'main':
main.c:50:22: error: expected expression before '%' token
   50 |     scanf("%d:%d",&a,%b);
      |                      ^
main.c:57:25: error: 'h' undeclared (first use in this function)
   57 |     printf("%d:%d:%d\n",h,m,s);
      |                         ^
main.c:57:27: error: 'm' undeclared (first use in this function)
   57 |     printf("%d:%d:%d\n",h,m,s);
      |                           ^
main.c:57:29: error: 's' undeclared (first use in this function)
   57 |     printf("%d:%d:%d\n",h,m,s);
      |                             ^
main.c: At top level:
main.c:95:5: error: redefinition of 'main'
   95 | int main(){
      |     ^~~~
main.c:2:5: note: previous definition of 'main' with type 'int()'
    2 | int main(){
      |     ^~~~
main.c: In function 'main':
main.c:97:22: error: expected expression before '%' token
   97 |     scanf("%d:%d",&a,%b);
      |                      ^
main.c:104:25: error: 'h' undeclared (first use in this function)
  104 |     printf("%d:%d:%d\n",h,m,s);
      |                         ^
main.c:104:27: error: 'm' undeclared (first use in this function)
  104 |     printf("%d:%d:%d\n",h,m,s);
      |                           ^
main.c:104:29: error: 's' undeclared (first use in this function)
  104 |     printf("%d:%d:%d\n",h,m,s);
      |                             ^
main.c: At top level:
main.c:142:5: error: redefinition of 'main'
  142 | int main(){
      |     ^~~~
main.c:2:5: note: previous definition of 'main' with type 'int()'
    2 | int main(){
      |     ^~~~
main.c: In function 'main':
main.c:144:22: error: expected expression before '%' token
  144 |     scanf("%d:%d",&a,%b);
      |                      ^
main.c:151:25: error: 'h' undeclared (first use in this function)
  151 |     printf("%d:%d:%d\n",h,m,s);
      |                         ^
main.c:151:27: error: 'm' undeclared (first use in this function)
  151 |     printf("%d:%d:%d\n",h,m,s);
      |                           ^
main.c:151:29: error: 's' undeclared (first use in this function)
  151 |     printf("%d:%d:%d\n",h,m,s);
      |                             ^