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Asc

Last update:
May 18, 2026

Description

Determines the ASCII value of a character.

Returns

The ASCII value of the first character of a string; if the string is empty, returns zero.

Category

String functions

Function syntax

Asc(string)

See also

Chr

History

ColdFusion MX: Changed Unicode support: ColdFusion supports the Java UCS-2 representation of Unicode characters, up to a value of 65536. (Earlier releases supported 1-255.)

Parameters

Parameter
Description
string
A string, an empty string, or a number.

Example

<cfscript>
       WriteOutput(Asc("") & "|"); //returns 0 since ASCII value of empty string is 0
       WriteOutput(Asc("a") & "|"); //returns 97 since ASCII value of "a" is 97
       WriteOutput(Asc("A") & "|"); //returns 65 since ASCIII value of "A" is 65
       WriteOutput(Asc("null") & "|"); //returns 110 since ASCII value of "n" is 110
       WriteOutput(Asc("Null")); //returns 78 since ASCII value of "N" is 78
</cfscript>
Output
0|97|65|110|78

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