# FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS
> Number of significand bits in the high word of a [double-precision floating-point number][ieee754].
## Usage
```javascript
var FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS = require( '@stdlib/constants/float64/num-high-word-significand-bits' );
```
#### FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS
Number of significand bits in the high word of a [double-precision floating-point number][ieee754].
```javascript
var bool = ( FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS === 20 );
// returns true
```
## Examples
```javascript
var FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS = require( '@stdlib/constants/float64/num-high-word-significand-bits' );
console.log( FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS );
// => 20
```
* * *
## C APIs
### Usage
```c
#include "stdlib/constants/float64/num_high_word_significand_bits.h"
```
#### STDLIB_CONSTANT_FLOAT64_NUM_HIGH_WORD_SIGNIFICAND_BITS
Number of significand bits in the high word of a [double-precision floating-point number][ieee754].
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985