double
fabs(double x);
long double
fabsl(long double x);
float
fabsf(float x);
The fabs() functions compute the absolute value of a floating-point num-
ber x.
fabs(+-0) returns 0.
fabs(+-infinity) returns +infinity.
abs(3), ceil(3), floor(3), rint(3), math(3)
The fabs() functions conform to ISO/IEC 9899:1999(E).
BSD November 20, 2002 BSD