Take a look at the following code:

#include int main(){  int i = 12;  std::cout 

Using '
' is a request to output a newline. Likewise, using endl requests to output a newline, but it also flushes the output stream. In other words, endl has the same effect as (ignoring the std:: for now):

 cout 
Or this:
 cout 
It's worth pointing out that these are different too: 
cout 
Note that Es last output request is for a char, hence operator Fs case, the last is a const char[2], and so operator