View Compilation Error

0_0_37414804_6611.cpp:5:1: error: 'string' does not name a type
 string h;
 ^
0_0_37414804_6611.cpp: In function 'int main()':
0_0_37414804_6611.cpp:8:5: error: 'h' was not declared in this scope
     h="HDU";
     ^
0_0_37414804_6611.cpp:13:17: error: 'cout' was not declared in this scope
                 cout << h;
                 ^
0_0_37414804_6611.cpp:14:10: error: 'cout' was not declared in this scope
          cout << endl;
          ^
0_0_37414804_6611.cpp:14:18: error: 'endl' was not declared in this scope
          cout << endl;
                  ^