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The increment operator ++ adds 1 to its operand, and the decrement operator -- subtracts 1 from its operand. Thus −
Both the increment and decrement operators can either precede (prefix) or follow (postfix) the operand. For example −
When an increment or decrement is used as part of an expression, there is an important difference in prefix and postfix forms. If you are using prefix form then increment or decrement will be done before rest of the expression, and if you are using postfix form, then increment or decrement will be done after the complete expression is evaluated.