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fabs() -- Mathematics Function (libm) Compute absolute value #include <math.h> double fabs(z) double z; fabs() implements the absolute value function. It returns z if z is zero or positive, or -z if z is negative. Example For an example of this function, see the entry for ceil(). See Also abs(), ceil(), floor(), frexp(), libm ANSI Standard, §7.5.6.2 POSIX Standard, §8.1