View Compilation Error

1_487_600_8106.cpp: In function `int main()':
1_487_600_8106.cpp:19: error: `gongyue' undeclared (first use this function)
1_487_600_8106.cpp:19: error: (Each undeclared identifier is reported only once for each function it appears in.)
1_487_600_8106.cpp: At global scope:
1_487_600_8106.cpp:22: error: `int gongyue' used prior to declaration
1_487_600_8106.cpp:22: error: `a' was not declared in this scope
1_487_600_8106.cpp:22: error: `b' was not declared in this scope
1_487_600_8106.cpp:23: error: initializer expression list treated as compound expression
1_487_600_8106.cpp:23: error: expected `,' or `;' before '{' token