View Compilation Error

0_0_18301215_31768.cpp: In function 'int main()':
0_0_18301215_31768.cpp:19:17: error: 'cout' was not declared in this scope
                 cout<<j<<endl;
                 ^
0_0_18301215_31768.cpp:19:26: error: 'endl' was not declared in this scope
                 cout<<j<<endl;
                          ^