/in/foo.c: In function 'main':
/in/foo.c:26:6: warning: unused variable 'k' [-Wunused-variable]
  int k = Insert(a, n, x);
      ^
/in/foo.c: In function 'Insert':
/in/foo.c:14:3: warning: 'i' is used uninitialized in this function [-Wuninitialized]
  a[i + 1] = x;
   ^