Pre-incrementoperators and post-increment operators

Hi, i bought a book about C and now im in chapter 6, theyre explaing stuff about Pre-incrementoperators and post-increment operators, but i dont really understand what they do. Please help me!

It just changes when the increment occours...

Code:

---

#include <stdio.h>
int main ()
{
 int x = 3;
 printf ("%d x\n", x); // Prints 3
 printf ("%d x++\n", x++); // Prints 3 again, then increments x to 4...
 printf ("%d x\n", x); // x is now 4, so prints 4.
 printf ("%d ++x\n", ++x); // Increments x to 5, then prints x (5)
 printf ("%d x\n", x); // x is now 5, so prints 5
 return 0;
}

---

If the line has ++x, then x is incremented before the line is evaluated. If the line has x++, then the line is evaluated before x is evaluated.

Very elegant explanation there, QC! Kudos!

What???