foo.c: In function 'main':
foo.c:24:6: warning: unused variable 'i' [-Wunused-variable]
   24 |  int i,n,a[9999],k;
      |      ^
foo.c: In function 'fun':
foo.c:7:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    7 |   scanf("%d",&a[i]);
      |   ^~~~~~~~~~~~~~~~~
foo.c:9:1: warning: control reaches end of non-void function [-Wreturn-type]
    9 | }
      | ^
foo.c: In function 'MoveLeft':
foo.c:21:1: warning: control reaches end of non-void function [-Wreturn-type]
   21 | }
      | ^
foo.c: In function 'main':
foo.c:25:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   25 |  scanf("%d",&n);
      |  ^~~~~~~~~~~~~~
foo.c:27:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   27 |  scanf("%d",&k);
      |  ^~~~~~~~~~~~~~

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