# trunc10
> Round a numeric value to the nearest power of 10 toward zero.
## Usage
```javascript
var trunc10 = require( '@stdlib/math/base/special/trunc10' );
```
#### trunc10( x )
Rounds a `numeric` value to the nearest power of 10 toward zero.
```javascript
var v = trunc10( -4.2 );
// returns -1.0
v = trunc10( -4.5 );
// returns -1.0
v = trunc10( -4.6 );
// returns -1.0
v = trunc10( 9.99999 );
// returns 1.0
v = trunc10( 9.5 );
// returns 1.0
v = trunc10( 13.0 );
// returns 10.0
v = trunc10( -13.0 );
// returns -10.0
v = trunc10( 0.0 );
// returns 0.0
v = trunc10( -0.0 );
// returns -0.0
v = trunc10( Infinity );
// returns Infinity
v = trunc10( -Infinity );
// returns -Infinity
v = trunc10( NaN );
// returns NaN
```
## Notes
- The function may not return accurate results for subnormals due to a general loss in precision.
```javascript
var v = trunc10( 1.0e-323 ); // should return 1.0e-323
// returns 0.0
```
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var trunc10 = require( '@stdlib/math/base/special/trunc10' );
var x;
var v;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
v = trunc10( x );
console.log( 'Value: %d. Rounded: %d.', x, v );
}
```