---
name: "fixsin"
section: "3alleg4"
platform: "linux"
package: "allegro4-doc"
version: "2:4.4.3.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/fixsin/3alleg4"
---

# fixsin(3alleg4)

Fixed point sine of binary angles. Allegro game programming library.

## NAME

fixsin - Fixed point sine of binary angles. Allegro game programming library.

## SYNOPSIS

**#include \<allegro.h\>**

**fixed fixsin(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:

```
   fixed angle;
   int result;
   /* Set the binary angle to 90 degrees. */
   angle = itofix(64);
   /* The sine of 90 degrees is one. */
   result = fixtoi(fixsin(angle));
   ASSERT(result == 1);
```

## RETURN VALUE

Returns the sine of a fixed point binary format angle. The return value will be in radians.

## SEE ALSO

, **ex12bit**(3alleg4), **ex3buf**(3alleg4), **exblend**(3alleg4), **excustom**(3alleg4), **exspline**(3alleg4), **exupdate**(3alleg4)