pre Decrement vs. post Decrement

Question

When should I use pre decrement and when to use post decrement?

and for the following code snippet, should I use pre or post decrement.

static privat         


        

Answer 1

You use pre-decrement if you want to decrement the variable before the value is passed on to the remaining expression. On the other hand, a post-decrement evaluates the expression before the variable is decremented:

int i = 100, x;
x = --i;                // both are 99

and

int i = 100, x;
x = i--;                // x = 100, i = 99

The same obviously is true for increments.