What is this?

Question

int x=2,y=1,z=2;

int c=(y,x,z);

cout<<c;

There was a challenge q that looked like that. What is (y,x,z)? Never seen that before.

Answer 1

That's the comma operator. When you see "(x, y, z)", it evaluates to the last item in the list. It's useful if you need to evaluate a statement before checking a condition, like "(statement, condition)".

Don't forget about operator precedence, though! The parentheses are important here. If it was "c=x,y,z", c would then be equal to x rather than z, because assignment has higher precedence than the comma operator.

Answer 2

Cool thanks.