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Assignment arithmetic

Each of the above operators can be combined with the assignment operator, =, as a shortcut for performing operations. Such assignments use the value to the right of the assignment operator to perform an operation with the value to the left. The result of the operation is then assigned to the value on the left.

 

=

assignment

assigns a value to a variable

+=

assign addition

adds a value to a variable

-=

assign subtraction

subtracts a value from a variable

*=

assign multiplication

multiplies a variable by a value

/=

assign division

divides a variable by a value

%=

assign remainder

returns a remainder after division

 

The following lines are examples using assignment arithmetic.

 

var i;

i = 2;

i is now 2

i += 3;

i is now 5, (2+3)

same as i = i + 3

i -= 3;

i is now 2, (5-3)

same as i = i - 3

i *= 5;

i is now 10, (2*5)

same as i = i * 5

i /= 3;

i is now 3, (10/3)

same as i = i / 3

i = 10;

i is now 10

i %= 3;

i is now 1, (10%3)

same as i = i % 3

 

Auto-increment (++) and auto-decrement (--)