foo.cc: In function 'int main()':
foo.cc:9:6: error: 'n' was not declared in this scope; did you mean 'yn'?
    9 |   if(n%10==0)
      |      ^
      |      yn
foo.cc:13:3: error: 'n' was not declared in this scope; did you mean 'yn'?
   13 |   n/=10;
      |   ^
      |   yn

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