View Compilation Error

0_0_20461409_16016.cpp:1:1: error: 'include' does not name a type
 include <iostream>
 ^
0_0_20461409_16016.cpp: In function 'int main(int, char**)':
0_0_20461409_16016.cpp:6:11: error: 'cin' was not declared in this scope
     while(cin>>a>>b)
           ^
0_0_20461409_16016.cpp:8:15: error: 's' was not declared in this scope
       int sum=s+b;
               ^
0_0_20461409_16016.cpp:9:7: error: 'cout' was not declared in this scope
       cout<<sum<<endl;
       ^
0_0_20461409_16016.cpp:9:18: error: 'endl' was not declared in this scope
       cout<<sum<<endl;
                  ^