View Compilation Error

0_0_35052929_31723.cpp:1:1: error: 'include' does not name a type
 include<iostream>
 ^
0_0_35052929_31723.cpp: In function 'int main()':
0_0_35052929_31723.cpp:5:8: error: 'cin' was not declared in this scope
  while(cin>>a>>b)  
        ^
0_0_35052929_31723.cpp:6:14: error: 'cout' was not declared in this scope
    {         cout<<a+b<<endl<<endl;    //经典在这里
              ^
0_0_35052929_31723.cpp:6:25: error: 'endl' was not declared in this scope
    {         cout<<a+b<<endl<<endl;    //经典在这里
                         ^
0_0_35052929_31723.cpp:8:12: error: expected '}' at end of input
    return 0;
            ^