fabsf(3)

fabsf3

Floating-point absolute value functions

Part of fabs(3).

Usage

#include <math.h>

double

fabs(double x);

float

fabsf(float x);

long double

fabsl(long double x);

Library

Math Library (libm, -lm)

Overview

The fabs(), fabsf() and fabsl() functions compute the absolute value of a floating-point number x.

Return values

The fabs(), fabsf() and fabsl() functions return the absolute value of x.

Releases

83 releases since FreeBSD 2.2.2-RELEASE; the text changed 43 times.

  1. 2.2.2–2.2.8
  2. 2.2.9
  3. 3.0–3.2
  4. 3.3–3.5.1
  5. 4.0–4.2
  6. 4.3–4.4
  7. 4.5–4.11
  8. 5.0–5.1
  9. 5.2–5.2.1
  10. 5.3–6.2
  11. 6.3
  12. 6.4
  13. 7.0
  14. 7.1
  15. 7.2
  16. 7.3
  17. 7.4
  18. 8.0
  19. 8.1
  20. 8.2
  21. 8.3
  22. 8.4
  23. 9.0
  24. 9.1
  25. 9.2
  26. 9.3
  27. 10.0
  28. 10.1
  29. 10.2
  30. 10.3
  31. 10.4
  32. 11.0
  33. 11.1
  34. 11.2
  35. 11.3
  36. 11.4
  37. 12.0
  38. 12.1
  39. 12.2
  40. 12.3
  41. 12.4
  42. 13.0–13.2
  43. 13.3–14.5
  44. 15.0–16.0

Standards

The fabs() function conforms to ISO/IEC 9899:1990 (“ISO C90”). The fabsf() and fabsl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).

From base 16.0-CURRENT-20261027-61c70dc16a79 in FreeBSD 16.0-CURRENT (2026-10-27). Parsed by carta from the page's mdoc source.