foo.c: In function 'main':
foo.c:12:18: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  int n1, n2, n3; scanf("%d%d%d", &n1, &n2, &n3);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c: In function 'Input':
foo.c:45:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ^~~~~~~~~~~~~~~~~~

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