---
name: "fixcos"
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/fixcos/3alleg4"
---

# fixcos(3alleg4)

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

## NAME

fixcos - Fixed point cosine of binary angles. Allegro game programming library.

## SYNOPSIS

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

**fixed fixcos(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:

```
   fixed angle;
   float result;
   /* Set the binary angle to 45 degrees. */
   angle = itofix(32);
   /* The cosine of 45 degrees is about 0.7071. */
   result = fixtof(fixcos(angle));
   ASSERT(result > 0.7 && result < 0.71);
```

## RETURN VALUE

Returns the cosine 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)