View Compilation Error

0_0_17986469_21242.cpp: In function 'int main()':
0_0_17986469_21242.cpp:35:9: error: 'a' was not declared in this scope
  cin >> a >> b;
         ^
0_0_17986469_21242.cpp:35:14: error: 'b' was not declared in this scope
  cin >> a >> b;
              ^