C: int x = k * (x1, x2, x3)?

Question

What exactly is this called in C?

If I have int x = 3 * (4, 5);

I end up with 15.

Can someone give explanation?

Is this a list where the result is just the first number times the last one?

Thanks

score 4 · Accepted Answer · answered Nov 04 '15 at 06:58

4

In the C and C++ programming languages, the comma operator (represented by the token ,) is a binary operator that evaluates its first operand and discards the result, and then evaluates the second operand and returns this value (and type).

https://en.wikipedia.org/wiki/Comma_operator

So, the result of the (4, 5) expression will be 5.

answered Nov 04 '15 at 06:58

mihai

4,592
3
29
42

2

Note: it doesn't "return" anything. – juanchopanza Nov 04 '15 at 07:00
2

@juanchopanza: The strictly correct word is "yield". – Keith Thompson Nov 04 '15 at 07:06
1

It's also important to note that the comma separating arguments in a function call is not a comma operator. – Keith Thompson Nov 04 '15 at 07:07

C: int x = k * (x1, x2, x3)?

1 Answers1