checking for alpha input

[jehammon]

how do I make sure that the user has entered a character contained in the alphabet

[Zaei]

Check the character's value against 'A'..'Z' and 'a'..'z'. If it is between one of them, it's alpha.

Z.

[jim mcnamara]

Use one of the macros in <ctype.h>

isalpha(char) is the best choice
isnumber(), ispunctuation(), isalmostanyhtingyouwantocheckfor()

- made up the last one.....

edit ctype.h, or go into help and look up either ctype or isalpha

[filburt1]

He posted this question in General VB too, so I think he wants a VB answer. Which makes me wonder why he posted in a C++ forum.

[Vlatko]

Just as extra info, you can also use the API. (VB & C++).

IsCharAlpha
IsCharAlphaNumeric

[filburt1]

And here are their prototypes (in VB ):

Declare Function IsCharAlpha Lib "user32" Alias "IsCharAlphaA" (ByVal cChar As Byte) As Long
Declare Function IsCharAlphaNumeric Lib "user32" Alias "IsCharAlphaNumericA" (ByVal cChar As Byte) As Long

[Megatron]

You don't need API for this (in VB).

If strFoo Like "[A-z]" Then...

[filburt1]

But isn't the Like operator really really really slow?