---
name: "ustrtod"
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/ustrtod"
---

# ustrtod(3alleg)

Converts a string into a floating point number. Allegro game programming library.

## NAME

ustrtod - Converts a string into a floating point number. Allegro game programming library.

## SYNOPSIS

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

**double ustrtod(const char \*s, char \*\*endp);**

## DESCRIPTION

This function converts as many characters of \`s' that look like a floating point number into one, and sets \`\*endp' to point to the first unused character, if \`endp' is not a NULL pointer. Example:

```
   char *endp, *string = "456.203 askdfg";
   double number = ustrtod(string, &endp);
```

## RETURN VALUE

Returns the string converted as a value of type \`double'. If nothing was converted, returns zero with \*endp pointing to the beginning of s.

## SEE ALSO

[**uconvert**(3alleg)](/uconvert/3alleg.md), [**ustrtol**(3alleg)](/ustrtol/3alleg.md), [**uatof**(3alleg)](/uatof/3alleg.md)