View Compilation Error

0_0_21611109_4654.cpp: In function 'int main()':
0_0_21611109_4654.cpp:48:3: error: 'cout' was not declared in this scope
   cout << endl;
   ^
0_0_21611109_4654.cpp:48:11: error: 'endl' was not declared in this scope
   cout << endl;
           ^