How does it work?

Question

What is the output of this code?

int x = 9;
x += ++x;
Console.Write(x);

//What is the valid output? This was in the C# challenge. I entered 20 and I was wrong!!

Answer 1

The correct answer is 19.
The program first places the value of x in the left hand side and then adds to it the incremented value. It will look like this at the end:
9 += ++9;
(= 19)

Answer 2

Wouldn't it be 19?
9 + (1+9) => 9+10 = 19

Answer 3

Ok! I was confused because it was pre-increment so I thought x will first increase then assigned. I got it now. Thanks! 😊😉😊

Answer 4

The answer is 19:
Let's simplify the statement to:
int x = 9;
x=x+(++x);
which means:
x=9+(10)=19