---
name: "SDL_strtod"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_strtod"
---

# SDL\_strtod(3)

Parse a double from a string.

## NAME

SDL\_strtod - Parse a **double** from a string.

## HEADER FILE

Defined in SDL3/SDL\_stdinc.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**double SDL\_strtod(const char \*str, char \*\*endp);**

## DESCRIPTION

This function makes fewer guarantees than the C runtime **strtod** :

• Only decimal notation is guaranteed to be supported. The handling of\
   scientific and hexadecimal notation is unspecified.

• Whether or not INF and NAN can be parsed is unspecified.

• The precision of the result is unspecified.

## FUNCTION PARAMETERS

- *str*

  the null-terminated string to read. Must not be NULL.

- *endp*

  if not NULL, the address of the first invalid character (i.e. the next character after the parsed number) will be written to this pointer.

## RETURN VALUE

Returns the parsed **double** , or 0 if no number could be parsed.

## THREAD SAFETY

It is safe to call this function from any thread.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_atoi**(3)](/SDL_atoi/3.md), **•**(3), [**SDL\_atof**(3)](/SDL_atof/3.md), **•**(3), [**SDL\_strtol**(3)](/SDL_strtol/3.md), **•**(3), [**SDL\_strtoll**(3)](/SDL_strtoll/3.md), **•**(3), [**SDL\_strtoul**(3)](/SDL_strtoul/3.md), **•**(3), [**SDL\_strtoull**(3)](/SDL_strtoull/3.md)