Adobe COLDFUSION 9 Manual page 46

Developing applications

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DEVELOPING COLDFUSION 9 APPLICATIONS

The CFML Programming Language

ColdFusion provides the following functions for identifying the data type of a variable:

• IsNumericDate

• IsPDFObject

• IsSimpleValue

ColdFusion also includes the following functions for determining whether a string can be represented as or converted

to another data type:

ColdFusion does not use a null data type. However, if ColdFusion receives a null value from an external source such

as a database, a Java object, or some other mechanism, it maintains the null value until you use it as a simple value. At

that time, ColdFusion converts the null to an empty string (""). Also, you can use the JavaCast function in a call to a

Java object to convert a ColdFusion empty string to a Java null.

ColdFusion supports integers and real numbers. You can intermix integers and real numbers in expressions; for

example, 1.2 + 3 evaluates to 4.2.

ColdFusion supports integers between -2,147,483,648 and 2,147,483,647 (32-bit signed integers). You can assign a

value outside this range to a variable, but ColdFusion initially stores the number as a string. If you use it in an

arithmetic expression, ColdFusion converts it into a floating-point value, preserving its value, but losing precision as

the following example shows:

<cfoutput>mybignum is: #mybignum#</cfoutput><br>

<cfoutput>mybignumtimes10 is: #mybignumtimes10# </cfoutput><br>

This example generates the following output:

mybignum is: 12345678901234567890

mybignumtimes10 is: 1.23456789012E+020

Last updated 8/5/2010