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itoa and negative numbers

 
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pebbert9



Joined: 31 Dec 2010
Posts: 39

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itoa and negative numbers
PostPosted: Tue Sep 14, 2021 8:54 pm     Reply with quote
Hello,

I am having trouble sending negative numbers out to a serial port. Does anyone see the issue with this test code?
I need to use an int48 and it works fine for positive numbers. I am using a PIC33CK32MP502 and compiler 5.105.

Code:

   char strTest[20] = {0};

   signed int48 Test = -100000;

   itoa(Test, 10, strTest);

   fprintf(rs485, "%s\r\n",strTest);


It is sending -4294967295 to the serial port.
Ttelmah



Joined: 11 Mar 2010
Posts: 19966

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PostPosted: Wed Sep 15, 2021 2:07 am     Reply with quote
OK.
Do you _'have'_ to use int48???.
There have been issues with the arithmetic for this type for just about
every compiler release for ages...
I suspect you will find it'll work OK, with int32, or int64.
Report it to CCS, but if you can as a 'get out of the problem' solution,
change to int64. If you need an int48 result, do the conversion using
int64 only. So:
Code:

   itoa((signed int64)Test, 10, strTest);
pebbert9



Joined: 31 Dec 2010
Posts: 39

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PostPosted: Wed Sep 15, 2021 5:39 am     Reply with quote
Thank you!

Converting to int64 worked.
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