Language: C

#include(stdio.h)
int main(void){
  int A,B;
  scanf("%d%d",&A,&B);
  if(A+B<A-B && A-B<A*B){printf("%d",A-B);}
  else if(A*B<A-B && A-B<A+B){printf("%d",A-B);}
  else if(A+B<A*B && A*B<A-B){printf("%d",A*B);}
  else if(A-B<A*B && A*B<A+B){printf("%d",A*B);}
  else if(A-b<A+B && A+B<A*B){printf("%d",A+B);}
  else if(A*B<A+B && A+B<A-B){printf("%d",A+B);}
  return 0;
}

Compiler output:
main.c:1:9: error: #include expects "FILENAME" or <FILENAME>
    1 | #include(stdio.h)
      |         ^
main.c: In function 'main':
main.c:4:3: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    4 |   scanf("%d%d",&A,&B);
      |   ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | #include(stdio.h)
main.c:4:3: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    4 |   scanf("%d%d",&A,&B);
      |   ^~~~~
main.c:4:3: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:5:26: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    5 |   if(A+B<A-B && A-B<A*B){printf("%d",A-B);}
      |                          ^~~~~~
main.c:5:26: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:5:26: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:5:26: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:6:31: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
    6 |   else if(A*B<A-B && A-B<A+B){printf("%d",A-B);}
      |                               ^~~~~~
main.c:6:31: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:7:31: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
    7 |   else if(A+B<A*B && A*B<A-B){printf("%d",A*B);}
      |                               ^~~~~~
main.c:7:31: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:8:31: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
    8 |   else if(A-B<A*B && A*B<A+B){printf("%d",A*B);}
      |                               ^~~~~~
main.c:8:31: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:9:13: error: 'b' undeclared (first use in this function)
    9 |   else if(A-b<A+B && A+B<A*B){printf("%d",A+B);}
      |             ^
main.c:9:13: note: each undeclared identifier is reported only once for each function it appears in
main.c:9:31: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
    9 |   else if(A-b<A+B && A+B<A*B){printf("%d",A+B);}
      |                               ^~~~~~
main.c:9:31: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:10:31: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
   10 |   else if(A*B<A+B && A+B<A-B){printf("%d",A+B);}
      |                               ^~~~~~
main.c:10:31: note: include '<stdio.h>' or provide a declaration of 'printf'