Asc

Description

Converts the first character of a string to its ASCII integer value.

Syntax

Asc ( string )

Argument	Description
string	The string for which you want the ASCII value of the first character

Returns

Integer. Returns the ASCII value of the first character in string. If string is null, Asc returns null.

Usage

You can use Asc to find out the case of a character by testing whether its ASCII value is within the appropriate range.

Examples

Example 1

This statement returns 65, the ASCII value for uppercase A:

Asc("A")

Example 2

This example checks if the first character of string ls_name is uppercase:

String ls_name

IF Asc(ls_name) > 64 and Asc(ls_name) < 91 THEN ...

Example 3

This example is a function that converts an array of integers into a string. Each integer specifies two characters. Its low byte is the first character in the pair and the high byte (ASCII * 256) is the second character. The function has an argument (iarr) which is the integer array:

string str_from_int, hold_str

integer arraylen

arraylen = UpperBound(iarr)

FOR i = 1 to arraylen

    // Convert first character of pair to a char

    hold_str = Char(iarr[i])

    // Add characters to string after converting

    // the integer's high byte to char

    str_from_int = &

    str_from_int + hold_str + &

    Char((iarr[i] - Asc(hold_str)) / 256)

NEXT

For sample code that builds the integer array from a string, see Mid.

Asc