MACROMEDIA Flash Lite 2, Справочник

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164 ActionScript language elements
% modulo operator
expression1 % expression2
Calculates the remainder of
expression1
divided by
expression2
. If either of the
expression
parameters are non-numeric, the modulo (
%
) operator attempts to convert them
to numbers. The
expression
can be a number or string that converts to a numeric value.
The sign of the result of modulo operation matches the sign of the dividend (the first
number). For example,
-4 % 3
and
-4 % -3
both evaluate to
-1
.
Availability: ActionScript 1.0; Flash Lite 1.0 - In Flash 4 files, the
%
operator is expanded in
the SWF file as
x - int(x/y) * y
and may not be as fast or as accurate in later versions of
Flash Player.
Operands
expression1 : Number
- A number or expression that evaluates to a number.
expression2 : Number
- A number or expression that evaluates to a number.
Returns
Number
- The result of the arithmetic operation.
Example
The following numeric example uses the modulo (
%)
operator:
trace(12%5); // traces 2
trace(4.3%2.1); // traces 0.0999999999999996
trace(4%4); // traces 0
The first trace returns 2, rather than 12/5 or 2.4, because the modulo (
%
) operator returns
only the remainder. The second trace returns 0.0999999999999996 instead of the expected
0.1 because of the limitations of floating-point accuracy in binary computing.
See also
/ division operator
,
round (Math.round method)
%= modulo assignment operator
expression1 %= expression2
Assigns
expression1
the value of
expression1 % expression2
. The following two
statements are equivalent:
x %= y; and x = x % y;