View Compilation Error

0_0_30712575_32557.cpp: In function 'int main()':
0_0_30712575_32557.cpp:5:12: error: 'a' was not declared in this scope
     cin >> a >> b;
            ^
0_0_30712575_32557.cpp:5:17: error: 'b' was not declared in this scope
     cin >> a >> b;
                 ^