/in/foo.c: In function 'main':
/in/foo.c:20:9: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
   20 |         scanf ("%d",&number);
      |         ^~~~~
/in/foo.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | int SUSHU(int number){
/in/foo.c:20:9: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
   20 |         scanf ("%d",&number);
      |         ^~~~~
/in/foo.c:20:9: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:45:17: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   45 |                 printf("Yes");
      |                 ^~~~~~
/in/foo.c:45:17: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:45:17: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
/in/foo.c:45:17: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:47:17: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
   47 |                 printf("No");
      |                 ^~~~~~
/in/foo.c:47:17: note: include '<stdio.h>' or provide a declaration of 'printf'