---
name: "ustrtod"
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/ustrtod/3alleg4"
---

# ustrtod(3alleg4)

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**(3alleg4), **ustrtol**(3alleg4), **uatof**(3alleg4)