C++

Reference

<cmath> (math.h)

function
<cmath> <ctgmath>

fabs

double fabs (double x);
 double fabs (double x); float fabsf (float x);long double fabsl (long double x);
 double fabs (double x); float fabs (float x);long double fabs (long double x);
 double fabs (double x); float fabs (float x);long double fabs (long double x); double fabs (T x); // additional overloads for integral types
Compute absolute value
Returns the absolute value of x: |x|.

Header <tgmath.h> provides a type-generic macro version of this function.
Additional overloads are provided in this header (<cmath>) for the integral types: These overloads effectively cast x to a double (defined for T being any integral type).

Parameters

x
Value whose absolute value is returned.

Return Value

The absolute value of x.

Example

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/* fabs example */ #include <stdio.h> /* printf */ #include <math.h> /* fabs */ int main () { printf ("The absolute value of 3.1416 is %f\n", fabs (3.1416) ); printf ("The absolute value of -10.6 is %f\n", fabs (-10.6) ); return 0; }

Output:
 The absolute value of 3.1416 is 3.141600 The absolute value of -10.6 is 10.600000


See also

abs
Absolute value (function)
labs
Absolute value (function)
floor
Round down value (function)
ceil
Round up value (function)
modf
Break into fractional and integral parts (function)