View Compilation Error

0_0_29586086_4236.cpp: In function 'int main()':
0_0_29586086_4236.cpp:5:13: error: 'a' was not declared in this scope
  while(cin>>a>>b)
             ^
0_0_29586086_4236.cpp:5:16: error: 'b' was not declared in this scope
  while(cin>>a>>b)
                ^