Stupid question from a beginner

Question

Why a is 12 and b is 13? https://code.sololearn.com/WbRSnoR3y7Oi/?ref=app

Answer 1

You should know about pre and post increment, and pre and post decrement to understand your problem.

a=13;
b=a--; // here a value is first assigned to b then a is decremented, since it is a post decrement operation.

So b will be 13.
But now a is decremented so when you print, it will result in 12.