Format
#include <math.h> double fabs(double x);
Language Level: ANSI, POSIX, XPG4
fabs calculates the absolute value of the floating-point argument
x.
Return Value
fabs returns the absolute value. There is no error
return value.
Example
This example calculates y as the absolute
value of x:
#include <math.h> #include <stdio.h>
int main(void)
{
double x, y;
x = -5.6798; y = fabs(x);
printf("fabs( %lf ) = %lf\n", x, y);
/***************************************
The output should be similar to:
fabs( -5.679800 ) = 5.679800 ***************************************/ }
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abs -- Calculate Integer Absolute Value
_cabs -- Calculate Absolute Value of
Complex Number
labs -- Calculate Absolute Value of Long
Integer
<math.h>