The operators ++ and – can be placed either before or after a variable.
When the operator goes after the variable, it is in “postfix form”: counter++. The “prefix form” is when the operator goes before the variable: ++counter. Both of these statements do the same thing: increase counter by 1.
Is there any difference? Yes, but we can only see it if we use the returned value of ++/–.
Let’s clarify. As we know, all operators return a value. Increment/decrement is no exception. The prefix form returns the new value while the postfix form returns the old value (prior to increment/decrement).