Can anyone explain this question?

Question

#include<iostream>

using namespace std;

int main()
{

int i=4, j=5, k=6, r;

r= ( i, j, k);

cout<<r;

return0;
}

Here, in this question I thought I would make some 'error', but the real answer is '6'

Can anyone explain me how the answer comes 6 instead of giving 'error'

Please help.

Answer 1

Amul Gaurav

here in r = (i, j, k) we are using comma operator

comma (,) can be used in 2 ways

1 - a separator
2 - an operator

So here using an operator which will not give error and print last value

If you do like this:

int i = 1, 2, 3;

Here we are using a comma separator which will give error

Answer 2

Now I get that, thanks a lot for your help guys

Answer 3

Have you tried running the code on sololearn?

It outputs 6 but gives a warning.