View Compilation Error

0_0_31648452_2738.cpp: In function 'int main()':
0_0_31648452_2738.cpp:44:21: error: 'sum' was not declared in this scope
                     sum++;
                     ^
0_0_31648452_2738.cpp:47:15: error: 'sum' was not declared in this scope
         cout<<sum<<endl;
               ^