char is 8 bits. In this environment it also defaults to signed. I assume
that cTemp is an int. What you are seeing is sign extension. Try declaring
theChar as unsigned char.
Ed Deinstadt
-----Original Message-----
From: Michael McFarland <[EMAIL PROTECTED]>
To: 'Palm Development List' <[EMAIL PROTECTED]>
Date: Friday, July 09, 1999 11:43 AM
Subject: handling characters
>Greetings all,
>
> I am getting started w/ Palm programming, and this is my first post.
> In working w/ serial communication I've stumbled on something that seems
>very strange to me. Consider the following code:
>
> #define MY_CHAR 0x80
>
> my_fun() {
> char theChar;
> char theString[10];
> int theBoolean;
>
> cTemp = 0x80;
>
> theBoolean = (theChar == MY_CHAR); // theBoolean is set to 0
> StrPrintF(theString, "%x", cTemp); // theString is set to
>"FFFFFF80", which is 4294967168 or -128
> }
>
> From what I've seen so far, cTemp is being set to a 4-byte value with
>three 'FF' bytes preceding the byte I specified. But the CW help files say
>a char is 8 bits, as I would expect on any system not using Unicode. So
>what am I missing?
>
> Michael McFarland
>
>
