# SDL_expf

Compute the exponential of `x`.

## Header File

Defined in [<SDL3/SDL_stdinc.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h)

## Syntax

```c
float SDL_expf(float x);
```

## Function Parameters

|       |       |                       |
| ----- | ----- | --------------------- |
| float | **x** | floating point value. |

## Return Value

(float) Returns value of `e^x`.

## Remarks

The definition of `y = exp(x)` is `y = e^x`, where `e` is the base of the
natural logarithm. The inverse is the natural logarithm,
[SDL_logf](SDL_logf).

Domain: `-INF <= x <= INF`

Range: `0 <= y <= INF`

The output will overflow if `exp(x)` is too large to be represented.

This function operates on single-precision floating point values, use
[SDL_exp](SDL_exp) for double-precision floats.

This function may use a different approximation across different versions,
platforms and configurations. i.e, it can return a different value given
the same input on different machines or operating systems, or if SDL is
updated.

## Thread Safety

It is safe to call this function from any thread.

## Version

This function is available since SDL 3.2.0.

## See Also

- [SDL_exp](SDL_exp)
- [SDL_logf](SDL_logf)

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryStdinc](CategoryStdinc)