View Compilation Error

0_0_37540659_18892.cpp: In function 'int main()':
0_0_37540659_18892.cpp:19:11: error: 'cout' was not declared in this scope
           cout<<i<<endl;
           ^
0_0_37540659_18892.cpp:19:20: error: 'endl' was not declared in this scope
           cout<<i<<endl;
                    ^