View Compilation Error

0_0_26725321_12310.cpp: In function 'int main()':
0_0_26725321_12310.cpp:4:15: error: 'a' was not declared in this scope
    while(cin>>a>>b){
               ^
0_0_26725321_12310.cpp:4:18: error: 'b' was not declared in this scope
    while(cin>>a>>b){
                  ^