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Altera_Forum's avatar
Altera_Forum
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19 years ago

About abs() function

I want to invoke abs() function in NiosII. But i find this function does not defined. Which header file should I include? or I should implement it by myslef?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

It should be there, as a part of newlib. Try including stdlib.h and see if that works.

Here's a brief description from a website I found: 

Synopsis
# include <stdlib.h>
int abs(int i);
Description
abs returns the absolute value of i (also called the magnitude of i). That is, if i is negative, the result is the opposite of i, but if i is nonnegative the result is i.
The similar function labs uses and returns long rather than int values.
Returns
The result is a nonnegative integer.
Portability
abs is ANSI.
No supporting OS subroutines are required.

- slacker