# Absolute Value
> Compute an [absolute value][absolute-value] of a signed 32-bit integer.
The [absolute value][absolute-value] is defined as
## Usage
```javascript
var labs = require( '@stdlib/math/base/special/labs' );
```
#### labs( x )
Computes an [absolute value][absolute-value] of a signed 32-bit integer.
```javascript
var v = labs( -1|0 );
// returns 1
v = labs( 2|0 );
// returns 2
v = labs( 0|0 );
// returns 0
```
## Notes
- The implementation assumes two's complement.
- In two's complement systems, the absolute value of the minimum signed 32-bit integer is out-of-range. The absolute value for the minimum signed 32-bit integer is thus undefined.
```javascript
// -2^31
var x = -2147483648|0;
var v = labs( x );
// returns -2147483648
```
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var labs = require( '@stdlib/math/base/special/labs' );
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = round( randu() * 100.0 ) - 50;
console.log( 'abs(%d) = %d', x, labs( x|0 ) );
}
```
* * *
## C APIs
### Usage
```c
#include "stdlib/math/base/special/labs.h"
```
#### stdlib_base_labs( x )
Computes the absolute value of a signed 32-bit integer in two's complement format.
```c
#include
int32_t y = stdlib_base_labs( -5 );
// returns 5
```
The function accepts the following arguments:
- **x**: `[in] int32_t` input value.
```c
int32_t stdlib_base_labs( const int32_t x );
```
### Examples
```c
#include "stdlib/math/base/special/labs.h"
#include
#include
int main() {
int32_t x[] = { 3, -3, 0, -10 };
int32_t y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_labs( x[ i ] );
printf( "|%i| = %i\n", x[ i ], y );
}
}
```
[absolute-value]: https://en.wikipedia.org/wiki/Absolute_value
