# isSameValueZero
> Test if two double-precision floating-point numbers are the same value.
## Usage
```javascript
var isSameValueZero = require( '@stdlib/number/float64/base/assert/is-same-value-zero' );
```
#### isSameValueZero( a, b )
Tests if two double-precision floating-point numbers `a` and `b` are the same value.
```javascript
var bool = isSameValueZero( 3.14, 3.14 );
// returns true
bool = isSameValueZero( 5.0, 3.0 );
// returns false
```
In contrast to the strict equality operator `===`, the function treats `NaNs` as the same value.
```javascript
var bool = ( NaN === NaN );
// returns false
bool = isSameValueZero( NaN, NaN );
// returns true
```
In contrast to the [SameValue Algorithm][@stdlib/number/float64/base/assert/is-same-value] (as specified in ECMAScript 5), the function does not distinguish between `+0` and `-0`.
```javascript
var bool = ( 0.0 === -0.0 );
// returns true
bool = isSameValueZero( 0.0, -0.0 );
// returns true
bool = isSameValueZero( -0.0, 0.0 );
// returns true
```
## Examples
```javascript
var isSameValueZero = require( '@stdlib/number/float64/base/assert/is-same-value-zero' );
var bool = isSameValueZero( 3.14, 3.14 );
// returns true
bool = isSameValueZero( 0.0, 0.0 );
// returns true
bool = isSameValueZero( -0.0, 0.0 );
// returns true
bool = isSameValueZero( NaN, NaN );
// returns true
```
* * *
## C APIs
### Usage
```c
#include "stdlib/number/float64/base/assert/is_same_value_zero.h"
```
#### stdlib_base_float64_is_same_value_zero( a, b )
Tests if two double-precision floating-point numbers `a` and `b` are the same value.
```c
#include
bool v = stdlib_base_float64_is_same_value_zero( 3.14, 3.14 );
// returns true
v = stdlib_base_float64_is_same_value_zero( 0.0, -0.0 );
// returns true
```
The function accepts the following arguments:
- **a**: `[in] double` first input value.
- **b**: `[in] double` second input value.
```c
bool stdlib_base_float64_is_same_value_zero( const double a, const double b );
```
### Examples
```c
#include "stdlib/number/float64/base/assert/is_same_value_zero.h"
#include
#include
int main( void ) {
const double a[] = {
5.0,
-2.0,
0.0,
0.0/0.0
};
const double b[] = {
5.0,
2.0,
-0.0,
0.0/0.0
};
bool v;
int i;
for ( i = 0; i < 4; i++ ) {
v = stdlib_base_float64_is_same_value_zero( a[ i ], b[ i ] );
printf( "Same value? %s\n", ( v ) ? "True" : "False" );
}
}
```
[@stdlib/number/float64/base/assert/is-same-value]: https://github.com/stdlib-js/number/tree/main/float64/base/assert/is-same-value