foo.c: In function 'main':
foo.c:40:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   40 |  scanf("%d%d%d",&n1,&n2,&n3);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:42:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   42 |   scanf("%d",&a1[i]);
      |   ^~~~~~~~~~~~~~~~~~
foo.c:44:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   44 |   scanf("%d",&a2[i]);
      |   ^~~~~~~~~~~~~~~~~~
foo.c:46:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   46 |   scanf("%d",&a3[i]);
      |   ^~~~~~~~~~~~~~~~~~

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