View Compilation Error

0_0_22318344_6241.cpp: In function 'int main()':
0_0_22318344_6241.cpp:47:13: error: 'cout' was not declared in this scope
             cout<<s<<endl;
             ^
0_0_22318344_6241.cpp:47:22: error: 'endl' was not declared in this scope
             cout<<s<<endl;
                      ^