---
name: "al_fixcos"
section: "3alleg5"
platform: "linux"
package: "allegro5-doc"
version: "2:5.2.10.1+dfsg-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/al_fixcos/3alleg5"
---

# al\_fixcos(3alleg5)

Allegro 5 API

## NAME

al\_fixcos - Allegro 5 API

## SYNOPSIS

-

  ```
  #include <allegro5/allegro.h>
  al_fixed al_fixcos(al_fixed x);
  ```

## DESCRIPTION

This function finds the cosine of a value using a lookup table. The input value must be a fixed point binary angle.

Example:

-

  ```
  al_fixed angle;
  float result;
  /* Set the binary angle to 45 degrees. */
  angle = al_itofix(32);
  /* The cosine of 45 degrees is about 0.7071. */
  result = al_fixtof(al_fixcos(angle));
  assert(result > 0.7 && result < 0.71);
  ```

## RETURN VALUE

Returns the cosine of a fixed point binary format angle as a fixed point value.