View Compilation Error

0_0_22961065_32624.cpp:1:1: error: 'include' does not name a type
 include <iostream>  
 ^
0_0_22961065_32624.cpp: In function 'int main()':
0_0_22961065_32624.cpp:45:11: error: 'cin' was not declared in this scope
     while(cin>>n)  
           ^
0_0_22961065_32624.cpp:57:9: error: 'cout' was not declared in this scope
         cout<<n-hungry()/2<<endl;  
         ^
0_0_22961065_32624.cpp:57:29: error: 'endl' was not declared in this scope
         cout<<n-hungry()/2<<endl;  
                             ^