What does that long minus after the variable mean?

Question

int x = 5, y =1;
do {
y++;
} while (x-- >= 0); // what is this minus sign doing there?
System.out.print(y);

found it in a challenge question by Petér Gyöngyik.
And this isn't the only question I found this in...

@Cлaвeн Ђервида thx, i haven't seen that this minus are two minus after eachother.

Soluion: Actually it is pretty hard to tell the difference between one or two minus signs in challenge questions on my tablet.

Answer 1

x-- maybe?

Answer 2

Can you give an example code?

Answer 3

I test that is cpp and it show me a error!