foo.cc: In function 'int Reverse(int)':
foo.cc:16:16: error: 'x' was not declared in this scope
   16 |  return n==xfs(x);
      |                ^
foo.cc: In function 'int main()':
foo.cc:22:14: error: 'n' was not declared in this scope
   22 |   if(Reverse(n)==1)
      |              ^

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