View Compilation Error

0_0_30538419_30705.cpp: In function 'int main()':
0_0_30538419_30705.cpp:3:7: error: 'cin' was not declared in this scope
 while(cin>>n>>m&&n||m){
       ^
0_0_30538419_30705.cpp:11:3: error: 'cout' was not declared in this scope
   cout<<s<<endl;
   ^
0_0_30538419_30705.cpp:11:12: error: 'endl' was not declared in this scope
   cout<<s<<endl;
            ^