foo.cc: In function 'int main()':
foo.cc:9:19: error: found ':' in nested-name-specifier, expected '::'
  cout << Zhouchang:c << endl;
                   ^
foo.cc:9:10: error: 'Zhouchang' has not been declared
  cout << Zhouchang:c << endl;
          ^~~~~~~~~
foo.cc:10:16: error: found ':' in nested-name-specifier, expected '::'
  cout << Mianji:d << endl;
                ^
foo.cc:10:10: error: 'Mianji' has not been declared
  cout << Mianji:d << endl;
          ^~~~~~

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