Increment & Decrement

Question

I think I understood the prefix, but Im kinda lost with the postfix.

public class Program {
public static void main(String[] args) {
int x = 34;
int y = x++;

System.out.println(y); //y=34

why Y isnt 35? What is it for? I mean, when do we use the postfix and how?

Is the first time I see Increment/decrement and Prefix and postfix so I guess it will make sense once I study it more I.

Answer 1

Aysha

z will be 36

After assigning value to y, x will be increase so x will be 35 then on ++x , x will be 36

Answer 2

Int x = 34;
~Post increment~
int y = x++; // this assigns x to y before incrementing, meaning y = 34 and x will be 35

~Pre-increment~
Then
int y = ++x; // this increments x first before it is assigned to y, meaning both x and y will have the value of 36.

Would like to be corrected

Answer 3

I mean, I know (or I think that I know) how it works, but I dont understand why, why should I use the postfix if using it I dont get any change :/ I guess it will make sense when I get used to it.

Answer 4

if you're using them alone, that doesn't make difference...

but if you're using while doing something else, that makes difference:

x = 0;
while (x<3) {
System.out.println(x++);
}

// 0 1 2

x = 0;
while (x<3) {
System.out.println(++x);
}

// 1 2' 3