View Compilation Error

0_0_29025231_20414.cpp: In function 'int main()':
0_0_29025231_20414.cpp:31:17: error: 'num' was not declared in this scope
                 num++;
                 ^
0_0_29025231_20414.cpp:33:16: error: 'num' was not declared in this scope
             if(num>0)
                ^