View Compilation Error

0_0_33290398_21614.cpp: In function 'int main()':
0_0_33290398_21614.cpp:8:8: error: 'cin' was not declared in this scope
  while(cin>>n>>m&&n!=0&&m!=0){
        ^
0_0_33290398_21614.cpp:35:3: error: 'cout' was not declared in this scope
   cout<<ans<<endl;
   ^
0_0_33290398_21614.cpp:35:14: error: 'endl' was not declared in this scope
   cout<<ans<<endl;
              ^