View Compilation Error

0_0_34166023_27340.cpp: In function 'void solve()':
0_0_34166023_27340.cpp:6:10: error: 'a' was not declared in this scope
  cout << a + b << endl;
          ^
0_0_34166023_27340.cpp:6:14: error: 'b' was not declared in this scope
  cout << a + b << endl;
              ^
0_0_34166023_27340.cpp: In function 'int main(int, char**)':
0_0_34166023_27340.cpp:16:15: error: 'a' was not declared in this scope
  while(cin >> a >> b)
               ^
0_0_34166023_27340.cpp:16:20: error: 'b' was not declared in this scope
  while(cin >> a >> b)
                    ^