# To Binary String
> Return a string giving the literal bit representation of a [single-precision floating-point number][ieee754].
## Usage
```javascript
var toBinaryStringf = require( '@stdlib/number/float32/base/to-binary-string' );
```
#### toBinaryStringf( x )
Returns a `string` giving the literal bit representation of a [single-precision floating-point number][ieee754].
```javascript
var toFloat32 = require( '@stdlib/number/float64/base/to-float32' );
var str = toBinaryStringf( toFloat32( 4.0 ) );
// returns '01000000100000000000000000000000'
str = toBinaryStringf( toFloat32( 3.141592653589793 ) );
// returns '01000000010010010000111111011011'
str = toBinaryStringf( toFloat32( -1.0e38 ) );
// returns '11111110100101100111011010011001'
```
The function handles [subnormals][subnormals].
```javascript
var toFloat32 = require( '@stdlib/number/float64/base/to-float32' );
str = toBinaryStringf( toFloat32( -3.14e-39 ) );
// returns '10000000001000100011000100001011'
str = toBinaryStringf( toFloat32( 1.4e-45 ) );
// returns '00000000000000000000000000000001'
```
The function handles special values.
```javascript
var PINF = require( '@stdlib/constants/float32/pinf' );
var NINF = require( '@stdlib/constants/float32/ninf' );
str = toBinaryStringf( 0.0 );
// returns '00000000000000000000000000000000'
str = toBinaryStringf( -0.0 );
// returns '10000000000000000000000000000000'
str = toBinaryStringf( NaN );
// returns '01111111110000000000000000000000'
str = toBinaryStringf( PINF );
// returns '01111111100000000000000000000000'
str = toBinaryStringf( NINF );
// returns '11111111100000000000000000000000'
```
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var pow = require( '@stdlib/math/base/special/pow' );
var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
var toBinaryStringf = require( '@stdlib/number/float32/base/to-binary-string' );
var frac;
var sign;
var exp;
var b;
var x;
var i;
// Convert random numbers to literal bit representations...
for ( i = 0; i < 100; i++ ) {
if ( randu() < 0.5 ) {
sign = -1.0;
} else {
sign = 1.0;
}
frac = randu() * 10.0;
exp = round( randu()*100.0 );
if ( randu() < 0.5 ) {
exp = -exp;
}
x = sign * frac * pow( 2.0, exp );
x = float64ToFloat32( x );
b = toBinaryStringf( x );
console.log( b );
}
```
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-2008
[subnormals]: https://en.wikipedia.org/wiki/Denormal_number