View Compilation Error

0_0_38497491_15333.cpp: In function 'int main()':
0_0_38497491_15333.cpp:7:18: error: 'a' was not declared in this scope
     while(cin >> a >> b)
                  ^
0_0_38497491_15333.cpp:7:23: error: 'b' was not declared in this scope
     while(cin >> a >> b)
                       ^