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7.4.23 Decrement (--) and Increment (++) Operators

++ and -- operators are used to increment or decrement a variable by one.
 

Syntax

result = ++variable

result = --variable

result = variable++

result = variable--

Syntax 2

++variable

--variable

variable++

variable-

Arguments

result
Any variable.
variable
Any variable.

Remarks

The increment and decrement operators are used as a shortcut to modify the value stored in a variable. The value of an expression containing one of these operators depends on whether the operator comes before or after the variable:
 

var j, k;

k = 2;

j = ++k;

j is assigned the value 3, as the increment occurs before the expression is evaluated. Contrast the following example:
 

var j, k;

k = 2;

j = k++;

Here, j is assigned the value 2, as the increment occurs after the expression is evaluated.
 

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