View Compilation Error

0_0_39910891_1056.cpp: In function 'int main()':
0_0_39910891_1056.cpp:6:15: error: 'a' was not declared in this scope
    6 |    while(cin>>a>>b){
      |               ^
0_0_39910891_1056.cpp:6:18: error: 'b' was not declared in this scope
    6 |    while(cin>>a>>b){
      |                  ^