foo.c: In function 'main':
foo.c:3:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    3 |     scanf("%d %d",&N,&K);
      |     ^~~~~
foo.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | int main(){
foo.c:3:5: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    3 |     scanf("%d %d",&N,&K);
      |     ^~~~~
foo.c:3:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
foo.c:5:5: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    5 |     printf("%d",N/K*K);
      |     ^~~~~~
foo.c:5:5: note: include '<stdio.h>' or provide a declaration of 'printf'
foo.c:5:5: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
foo.c:5:5: note: include '<stdio.h>' or provide a declaration of 'printf'
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