ISALPHA Function

Returns a true value if the expression is a string made up entirely of alphabetic characters.

Category:	Information and Conversion
Returned data type:	Integer
Note:	The returned value is a Boolean value, true if the "in_string" contains only alpha characters. Otherwise, the value is false.

Syntax

Required Argument

Details

Examples

Syntax

ISALPHA(<in_string>)

Required Argument

in string

a string of characters that is searched for any alphabetic characters.

Details

The ISALPHA function returns true if "in_string" is determined to be a string containing only alpha characters.

Examples

Example 1

// Expression
string letters
letters="lmnop" 
string mixed
mixed="1a2b3c"
 
string alphatype
alphatype=isalpha(letters) // returns true
string mixedtype
mixedtype=isalpha(mixed) // returns false

Example 2

string all_Alpha
all_Alpha="abcdefghijklmnoprstuvyz"
 
string non_Alpha
non_Alpha="%&)#@*0123456789"
 
string error_message1
string error_message2
 
if (NOT isalpha(all_Alpha))
   error_message1 ="all_Alpha string contains alpha numeric characters"
else
   error_message1 ="all_Alpha string contains alpha numeric characters"
 
if(isalpha(non_Alpha))
   error_message2= "non_Alpha string contains alpha numeric characters"
else
   error_message2= "non_Alpha string does not contain alpha numeric characters"

Example 3

string all_Alpha
string error_message
all_Alpha="abcdefghijklmnopqrstuvwxyz"
if (isalpha(all_Alpha))
   begin
        error_message= "alpha strings were identified as alpha"
   end