foo.c: In function 'main':
foo.c:36:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   36 |  scanf("%d",&n1);
      |  ^~~~~~~~~~~~~~~
foo.c:37:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   37 |  scanf("%d",&n2);
      |  ^~~~~~~~~~~~~~~
foo.c:38:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   38 |  scanf("%d",&n3);
      |  ^~~~~~~~~~~~~~~
foo.c:40:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   40 |  scanf("%d",&a1[i]);
      |  ^~~~~~~~~~~~~~~~~~
foo.c:42:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   42 |  scanf("%d",&a2[j]);
      |  ^~~~~~~~~~~~~~~~~~
foo.c:44:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   44 |  scanf("%d",&a3[k]);
      |  ^~~~~~~~~~~~~~~~~~

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