View Compilation Error

0_0_19621730_10844.cpp: In function 'int main()':
0_0_19621730_10844.cpp:38:1: error: 'cout' was not declared in this scope
 cout<<s<<endl;
 ^
0_0_19621730_10844.cpp:38:10: error: 'endl' was not declared in this scope
 cout<<s<<endl;
          ^