foo.c: In function 'main':
foo.c:7:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'long long int *' [-Wformat=]
  scanf("%d %d %d %d", &a, &b, &c, &d);
         ~^            ~~
         %lld
foo.c:7:13: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'long long int *' [-Wformat=]
  scanf("%d %d %d %d", &a, &b, &c, &d);
            ~^             ~~
            %lld
foo.c:7:16: warning: format '%d' expects argument of type 'int *', but argument 4 has type 'long long int *' [-Wformat=]
  scanf("%d %d %d %d", &a, &b, &c, &d);
               ~^              ~~
               %lld
foo.c:7:19: warning: format '%d' expects argument of type 'int *', but argument 5 has type 'long long int *' [-Wformat=]
  scanf("%d %d %d %d", &a, &b, &c, &d);
                  ~^               ~~
                  %lld
foo.c:7:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d %d", &a, &b, &c, &d);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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