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. |
ISALPHA (<in_string>)
in string
a string of characters to be searched for any alphabetic characters
The isalpha function returns true if "in_string" is determined to be a string containing only alpha characters.
// Expression
string letters
letters="lmnop"
string mixed
mixed="1a2b3c"
string alphatype
alphatype=isalpha(letters) // returns true
string mixedtype
mixedtype=isalpha(mixed) // returns false
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"
string all_Alpha
string error_message
all_Alpha="abcdefghijklmnopqrstuvwxyz"
if (isalpha(all_Alpha))
begin
error_message= "alpha strings were identified as alpha"
end