In output why the value of x decreases to 2

I have just started to learn the 'C' language. I was practicing some problems and faced this doubt.

#include <stdio.h>
int main()
{ 
    int x=4, y, z;
    y=--x;
    z=x--;
    printf("%d %d %d\n", x, y, z);
    return 0;
}