# Absolute Value
> Compute the [absolute value][absolute-value] of a single-precision floating-point number.
The [absolute value][absolute-value] is defined as
## Usage
```javascript
var absf = require( '@stdlib/math/base/special/absf' );
```
#### absf( x )
Computes the [absolute value][absolute-value] of a single-precision floating-point number.
```javascript
var v = absf( -1.0 );
// returns 1.0
v = absf( 2.0 );
// returns 2.0
v = absf( 0.0 );
// returns 0.0
v = absf( -0.0 );
// returns 0.0
v = absf( NaN );
// returns NaN
```
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var absf = require( '@stdlib/math/base/special/absf' );
var rand;
var i;
for ( i = 0; i < 100; i++ ) {
rand = round( randu() * 100.0 ) - 50.0;
console.log( 'absf(%d) = %d', rand, absf( rand ) );
}
```
* * *
## C APIs
### Usage
```c
#include "stdlib/math/base/special/absf.h"
```
#### stdlib_base_absf( x )
Computes the squared absolute value of a single-precision floating-point number.
```c
float y = stdlib_base_absf( -5.0f );
// returns 5.0f
```
The function accepts the following arguments:
- **x**: `[in] float` input value.
```c
float stdlib_base_absf( const float x );
```
### Examples
```c
#include "stdlib/math/base/special/absf.h"
#include
int main() {
float x[] = { 3.14f, -3.14f, 0.0f, 0.0f/0.0f };
float y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_absf( x[ i ] );
printf( "|%f| = %f\n", x[ i ], y );
}
}
```
[absolute-value]: https://en.wikipedia.org/wiki/Absolute_value
