foo.c: In function 'main':
foo.c:29:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   29 |  scanf("%d",&n1);
      |  ^~~~~~~~~~~~~~~
foo.c:30:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   30 |  scanf("%d",&n2);
      |  ^~~~~~~~~~~~~~~
foo.c:32:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   32 |  scanf("%d",&a[i]);
      |  ^~~~~~~~~~~~~~~~~
foo.c:34:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   34 |  scanf("%d",&b[j]);
      |  ^~~~~~~~~~~~~~~~~

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