View Compilation Error

0_0_37347718_26527.cpp: In function 'int main()':
0_0_37347718_26527.cpp:30:13: error: 'cout' was not declared in this scope
             cout<<i<<endl;      
             ^
0_0_37347718_26527.cpp:30:22: error: 'endl' was not declared in this scope
             cout<<i<<endl;      
                      ^