User Guide

RandRange 805

RandRange

Description

Generates a pseudo-random integer in the range between two specified numbers.

Returns

A pseudo-random integer.

See also

Rand

, Randomize

Parameters

Usage

Very large positive or negative values for the number1 and number2 parameters might result in

poor randomness in the results. To prevent this problem, do not specify numbers outside the

range -1,000,000,000 – 1,000,000,000.

ColdFusion MX 7 uses the Java Cryptography Extension (JCE) and installs a Sun Java 1.4.2

runtime that includes the Sun JCE default security provider. This provider includes the

algorithms listed in the Parameters section (except the default algorithm). The JCE framework

includes facilities for using other provider implementations; however, Macromedia cannot

provide technical support for third-party security providers.

Parameter Description

number1, number2 Integer numbers. If the numbers are not in the range -2,147,483,648

–

2,147,483,647, ColdFusion generates an error.

algorithm (Optional) The algorithm to use to generated the random number.

ColdFusion MX installs a cryptography library with the following algorithms:

• CFMX_COMPAT: the algorithm used in ColdFusion MX (default).

• SHA1PRNG: generates a number using the Sun Java SHA1PRNG

algorithm. This algorithm provides greater randomness than the default

algorithm

• IBMSecureRandom: for IBM WebSphere (IBM JVM does not support

the SHA1PRNG algorithm.)