FABS(3) BSD Programmer's Manual FABS(3) NNAAMMEE ffaabbss - floating-point absolute value function SSYYNNOOPPSSIISS ##iinncclluuddee <<mmaatthh..hh>> _d_o_u_b_l_e ffaabbss(_d_o_u_b_l_e _x); DDEESSCCRRIIPPTTIIOONN The ffaabbss() function computes the absolute value of a floating-point num- ber _x. RREETTUURRNN VVAALLUUEESS The ffaabbss() function returns the absolute value of _x. SSEEEE AALLSSOO abs(3), ceil(3), floor(3), rint(3), ieee(3), math.3 SSTTAANNDDAARRDDSS The ffaabbss() function conforms to ANSI C X3.159-1989 (``ANSI C ''). 4.4BSD June 4, 1993 1