foo.c: In function 'main':
foo.c:40:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=0;i<(n1+n2);i++)printf("%d ",arr1[i]);printf("\n");
  ^~~
foo.c:40:50: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  for(int i=0;i<(n1+n2);i++)printf("%d ",arr1[i]);printf("\n");
                                                  ^~~~~~
foo.c:34:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&n1,&n2,&n3);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:35:23: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<n1;i++)scanf("%d",&a1[i]);
                       ^~~~~~~~~~~~~~~~~~
foo.c:36:23: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<n2;i++)scanf("%d",&a2[i]);
                       ^~~~~~~~~~~~~~~~~~
foo.c:37:23: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<n3;i++)scanf("%d",&a3[i]); 
                       ^~~~~~~~~~~~~~~~~~

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