Arithmetic cout like cout << 2+2; prints 4 in Visual Studio, but does not print anything in gcc compiler. Why ?

Question

In C++, cout for basic arithmetic operations gives out result directly, but it is not in GCC 5.4.0.

Answer 1

https://code.sololearn.com/cOx2SMSZBtYj/?ref=app

works fine here too.

Answer 2

From the observations posted here, I think it has to do with how the compiler handles the operator precedence.

It most probably evaluated (cout << 2) and then added 2 to the cout object. (But this should not have compiled properly... )

Observe what happens when you do:

cout << cout;

I might need you to try what happens when you do:

cout << (cout << 2 + 2);

Answer 3

I just tried to run cout << 2+2; on an online compiler with GCC 5.4.0, and it gave me 4, so I'm not sure what is causing the issue on your side.

Answer 4

http://en.cppreference.com/w/cpp/language/operator_precedence
This is an error in gcc.

Answer 5

This was due to our connection. Now it outputs 4.

Answer 6

With () braces, it works. Strange...

Answer 7

Nope, still with () too.

Answer 8

It is not showing anything.

Answer 9

In SL, there is no output.