abs function in C

Question

Hi people!

I wrote some code in C (not in C++):

Mask1 = abs(Area1 * 2 + Area2 * -2);

Area1, Area2 and Mask1 are three double variables. (e.g. 3.00556, 34.3333) My problem is that abs returns an integer value (e.g 30).

What I need to do to fix it?

Regards.

Answer 1

Use fabs

Answer 2

Use fabs()

Answer 3

fabs http://www.manpagez.com/man/3/fabs/

Answer 4

abs() takes an integer as an argument and returns an integer result. Your doubles are being automatically truncated to integers. A decent C++ compiler would give you a warning. ;)

The function to use here is fabs() for doubles or fabsf() for floats.

Answer 5

use fabs()