Abstract: The decrement operator (--) decrements its operand by 1. The decrement operator can appear before or after its operand: --variable and variable--. The first form is a prefix decrement operation. The result of the operation is the value of the operand "after" it has been decremented. The second form is a postfix decrement operation. The result of the operation is the value of the operand "before" it has been decremented.