View Compilation Error

0_0_20461423_19159.cpp:1:1: error: 'include' does not name a type
 include <iostream>
 ^
0_0_20461423_19159.cpp: In function 'int main(int, char**)':
0_0_20461423_19159.cpp:6:11: error: 'cin' was not declared in this scope
     while(cin>>a>>b)
           ^
0_0_20461423_19159.cpp:10:9: error: 'cout' was not declared in this scope
         cout<<sum<<endl;
         ^
0_0_20461423_19159.cpp:10:20: error: 'endl' was not declared in this scope
         cout<<sum<<endl;
                    ^