The “Shortcut” (“Arithmetic”) Assignment Operators

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Computer Programming I Instructor: Greg Shaw

COP 2210

The “Shortcut” (“Arithmetic”) Assignment Operators

As the name applies, the shortcut (aka: arithmetic) assignment operators (*=, /=, %=, +=, -=) combine an arithmetic operation with an assignment statement,

Any assignment statement in this form

variable = variable operator expression ;
where variable is the same variable on both sides of the assignment operator, and

operator is any arithmetic operator (*,/,%.+,-)
may also be written with one of these operators, like this:
variable operator= expression ;

Examples

1. (From ChangeMaker.java)

changeDue = changeDue % 100 ;
can also be written: changeDue %= 100 ;
2. (To increment a counter)
count = count + 1 ;
can also be written: count += 1 ;
3. (made up example)
a = a * (b + c) ;
can also be written: a *= b + c ;

Note that ()’s are not required because the precedence of the arithmetic operators is higher than that of the assignment operators

Remember, the assignment statement must be in this form:

variable = variable operator expression ;

so there is no way to use a shortcut assignment operator to rewrite an assignment such as
x = 1 – x ;

Directory: ~shawg -> 2210
2210 -> Intro to The Arrays Class I. Terminology data structure
2210 -> A brief History of Programming Languages

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