# Truncate
> Round a single-precision floating-point number toward zero.
## Usage
```javascript
var truncf = require( '@stdlib/math/base/special/truncf' );
```
#### truncf( x )
Rounds a single-precision floating-point number toward zero.
```javascript
var v = truncf( -4.2 );
// returns -4.0
v = truncf( 9.99999 );
// returns 9.0
v = truncf( 0.0 );
// returns 0.0
v = truncf( -0.0 );
// returns -0.0
v = truncf( NaN );
// returns NaN
v = truncf( Infinity );
// returns Infinity
v = truncf( -Infinity );
// returns -Infinity
```
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var truncf = require( '@stdlib/math/base/special/truncf' );
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
console.log( 'trunc(%d) = %d', x, truncf( x ) );
}
```
* * *
## C APIs
### Usage
```c
#include "stdlib/math/base/special/truncf.h"
```
#### stdlib_base_truncf( x )
Rounds a single-precision floating-point number toward zero.
```c
float y = stdlib_base_truncf( 3.5f );
// returns 3.0f
```
The function accepts the following arguments:
- **x**: `[in] float` input value.
```c
float stdlib_base_truncf( const float x );
```
### Examples
```c
#include "stdlib/math/base/special/truncf.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_truncf( x[ i ] );
printf( "trunc(%f) = %f\n", x[ i ], y );
}
}
```