What is a preincrementing variable: PreIncrementing means that the variable is incrementedbefore the expression is evaluated: Example
++J
What is a postincrementing variable: Postincremting means that the variable is incremented after the expression: Example
J++
The main difference between a preincrementing and postincrementing variable is that if you want the expression to be evaluated before the expression use preincremeting, if you need to evalute after the expression use the postincremeting. The difference is in which order has the incremented going to happen.
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