foo.c: In function 'Insert':
foo.c:28:6: warning: unused variable 'i' [-Wunused-variable]
  int i,d;
      ^
foo.c: In function 'main':
foo.c:8:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~
foo.c:12:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&xx);
   ^~~~~~~~~~~~~~~
foo.c:16:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&c);
  ^~~~~~~~~~~~~~

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