View Compilation Error

0_0_18795339_6084.cpp: In function 'int main(int, char**)':
0_0_18795339_6084.cpp:7:15: error: 'a' was not declared in this scope
    while(cin>>a>>b){
               ^
0_0_18795339_6084.cpp:7:18: error: 'b' was not declared in this scope
    while(cin>>a>>b){
                  ^