foo.cc: In function 'int main()':
foo.cc:8:17: error: 'o' was not declared in this scope
  a=120*(x+0.5*y+o.6*z);
                 ^
foo.cc:8:18: error: expected ')' before numeric constant
  a=120*(x+0.5*y+o.6*z);
                  ^~

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