---
name: "fixsin"
section: "3alleg"
platform: "linux"
package: "liballegro-doc"
version: "2:4.2.2-2.2"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/fixsin"
---

# fixsin(3alleg)

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**(3alleg)](/ex12bit/3alleg.md), [**ex3buf**(3alleg)](/ex3buf/3alleg.md), [**exblend**(3alleg)](/exblend/3alleg.md), [**excustom**(3alleg)](/excustom/3alleg.md), [**exspline**(3alleg)](/exspline/3alleg.md), [**exupdate**(3alleg)](/exupdate/3alleg.md)