foo.c: In function 'main':
foo.c:6:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  int n; scanf("%d",&n);
         ^~~~~~~~~~~~~~
foo.c:9:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i]);
   ^~~~~~~~~~~~~~~~~
foo.c: In function 'FindMax':
foo.c:31:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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