---
name: "al_fixsin"
section: "3"
platform: "linux"
package: "allegro"
version: "5.2.11.3-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/al_fixsin"
---

# al\_fixsin(3)

Allegro 5 API

## NAME

al\_fixsin - Allegro 5 API

## SYNOPSIS

-

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

## DESCRIPTION

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

Example:

-

  ```
  al_fixed angle;
  int result;
  /* Set the binary angle to 90 degrees. */
  angle = al_itofix(64);
  /* The sine of 90 degrees is one. */
  result = al_fixtoi(al_fixsin(angle));
  assert(result == 1);
  ```

## RETURN VALUE

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