foo.c: In function 'main':
foo.c:21:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   21 |    scanf("%d%d%d\n",&n1,&n2,&n3);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:23:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   23 |     scanf("%d",&s1[i]);
      |     ^~~~~~~~~~~~~~~~~~
foo.c:25:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   25 |     scanf("%d",&s2[i]);
      |     ^~~~~~~~~~~~~~~~~~
foo.c:27:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   27 |     scanf("%d",&s3[i]);
      |     ^~~~~~~~~~~~~~~~~~

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