What are the rules for ++ and -- operators?

Rules for ++ and – operators: 

Following are the rules for the increment (++) and decrement (--) operators.

  1. Increment (++) and decrement (--) operators are unary operators and they require variable as their operands.
  2. 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.
  3. 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 -.

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