foo.cc: In function 'int main()':
foo.cc:10:14: error: 'b' was not declared in this scope
  if(x==a*a*a+b*b*b+c*c*c)
              ^
foo.cc:10:20: error: 'c' was not declared in this scope
  if(x==a*a*a+b*b*b+c*c*c)
                    ^

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