foo.c: In function 'main':
foo.c:5:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    5 |  scanf("%d", &d);
      |  ^~~~~
foo.c:5:2: warning: incompatible implicit declaration of built-in function 'scanf'
foo.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | void SetInter(int a[], int b[], int c, int d);
foo.c:21:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   21 |  printf("\n");
      |  ^~~~~~
foo.c:21:2: warning: incompatible implicit declaration of built-in function 'printf'
foo.c:21:2: note: include '<stdio.h>' or provide a declaration of 'printf'
foo.c: In function 'SetInter':
foo.c:39:5: warning: incompatible implicit declaration of built-in function 'printf'
   39 |     printf("%d ", a[i]);
      |     ^~~~~~
foo.c:39:5: note: include '<stdio.h>' or provide a declaration of 'printf'

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