# isEqual
> Test whether two double-precision complex floating-point numbers are equal.
## Usage
```javascript
var isEqual = require( '@stdlib/complex/float64/base/assert/is-equal' );
```
#### isEqual( z1, z2 )
Tests whether two double-precision complex floating-point numbers are equal.
```javascript
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var z1 = new Complex128( 5.0, 3.0 );
var z2 = new Complex128( 5.0, 3.0 );
var out = isEqual( z1, z2 );
// returns true
```
## Examples
```javascript
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var isEqual = require( '@stdlib/complex/float64/base/assert/is-equal' );
var z1 = new Complex128( 5.0, 3.0 );
var z2 = new Complex128( 5.0, 3.0 );
var out = isEqual( z1, z2 );
// returns true
z1 = new Complex128( -5.0, -3.0 );
z2 = new Complex128( 5.0, 3.0 );
out = isEqual( z1, z2 );
// returns false
z1 = new Complex128( NaN, 3.0 );
z2 = new Complex128( NaN, 3.0 );
out = isEqual( z1, z2 );
// returns false
```
* * *
## C APIs
### Usage
```c
#include "stdlib/complex/float64/base/assert/is_equal.h"
```
#### stdlib_base_complex128_is_equal( z1, z2 )
Tests whether double-precision complex floating-point numbers are equal.
```c
#include "stdlib/complex/float64/ctor.h"
#include
stdlib_complex128_t z1 = stdlib_complex128( 5.0, 2.0 );
stdlib_complex128_t z2 = stdlib_complex128( 5.0, 2.0 );
bool v = stdlib_base_complex128_is_equal( z1, z2 );
```
The function accepts the following arguments:
- **z1**: `[in] stdlib_complex128_t` first double-precision complex floating-point number.
- **z2**: `[in] stdlib_complex128_t` second double-precision complex floating-point number.
```c
bool stdlib_base_complex128_is_equal( const stdlib_complex128_t z1, const stdlib_complex128_t z2 );
```
### Examples
```c
#include "stdlib/complex/float64/base/assert/is_equal.h"
#include "stdlib/complex/float64/ctor.h"
#include
#include
int main( void ) {
const stdlib_complex128_t z[] = {
stdlib_complex128( 5.0, 2.0 ),
stdlib_complex128( -2.0, 1.0 ),
stdlib_complex128( 0.0, -0.0 ),
stdlib_complex128( 0.0/0.0, 0.0/0.0 )
};
bool v;
int i;
for ( i = 0; i < 4; i++ ) {
v = stdlib_base_complex128_is_equal( z[ i ], z[ i ] );
printf( "Equal? %s\n", ( v ) ? "True" : "False" );
}
}
```