View Compilation Error

0_0_6676889_20778.cpp: In function `int main()':
0_0_6676889_20778.cpp:39: error: `num' undeclared (first use this function)
0_0_6676889_20778.cpp:39: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6676889_20778.cpp: At global scope:
0_0_6676889_20778.cpp:41: error: expected unqualified-id before "return"
0_0_6676889_20778.cpp:41: error: expected `,' or `;' before "return"
0_0_6676889_20778.cpp:42: error: expected declaration before '}' token