Rules for ++ and – operators:Following are the rules for the increment (++) and decrement (--) operators.
- Increment (++) and decrement (--) operators are unary operators and they require variable as their operands.
- When postfix ++ (or --) is used with a variable in an expression, the expression is evaluated first using the original value of the variable and then the variable is incremented (or decremented) by one.
- When prefix ++ (or --) is used in an expression, the variable is incremented (or decremented) first and then the expression is evaluated using the new value of the variable.
The precedence and associatively of ++ and --operators are the same as those of unary + and unary -.