Expression “variable, variable = value;”

Question

I have been looking through some MFC code and i came across this expression. It was in OnInitDialog() function, didn\'t look like it\'s MFC specific. The variables had some

Answer 1

This is likely an error in the program. The statement

a, b = c;

Is completely equivalent to

b = c;

Since the comma operator evaluates from left to right and discards all values except the last. Since the expression a has no side effects, it's essentially a no-op.

I would suspect that this is either programmer error or an incorrect translation of code from a different language into C++. You should contact the author to let them know about this.

Hope this helps!