Duane Wessels wrote:
> My reason for using an int cast is:
> int isalnum(int c)
> int isalpha(int c)
> int isascii(int c)
> int iscntrl(int c)
Yes, that is the correct prototypes, but it does not say that you can
safely typecast char into int and send the resulting value to these
functions. You need to read the description as well as the prototype.
The reason why int is used and not unsigned char is that EOF is a valid
input and EOF is not an unsigned char (it is no character at all, not
even a control character). EOF is usually defined as -1.
/Henrik
Received on Tue Jul 29 2003 - 13:15:57 MDT
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