View Compilation Error

0_0_29344262_7965.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include iostream
          ^
0_0_29344262_7965.cpp:2:10: error: #include expects "FILENAME" or <FILENAME>
 #include iomanip
          ^
0_0_29344262_7965.cpp: In function 'int main()':
0_0_29344262_7965.cpp:7:11: error: 'cin' was not declared in this scope
     while(cin>>n && n){
           ^
0_0_29344262_7965.cpp:20:9: error: 'cout' was not declared in this scope
         cout<<fixed<<setprecision(1)<<sum/2<<endl;
         ^
0_0_29344262_7965.cpp:20:15: error: 'fixed' was not declared in this scope
         cout<<fixed<<setprecision(1)<<sum/2<<endl;
               ^
0_0_29344262_7965.cpp:20:36: error: 'setprecision' was not declared in this scope
         cout<<fixed<<setprecision(1)<<sum/2<<endl;
                                    ^
0_0_29344262_7965.cpp:20:46: error: 'endl' was not declared in this scope
         cout<<fixed<<setprecision(1)<<sum/2<<endl;
                                              ^