isSameValuef

Test if two single-precision floating-point numbers are the same value.

Usage

var isSameValuef = require( '@stdlib/number/float32/base/assert/is-same-value' );

isSameValuef( a, b )

Tests if two single-precision floating-point numbers a and b are the same value.

var toFloat32 = require( '@stdlib/number/float64/base/to-float32' );

var bool = isSameValuef( toFloat32( 3.14 ), toFloat32( 3.14 ) );
// returns true

bool = isSameValuef( toFloat32( 5.0 ), toFloat32( 3.0 ) );
// returns false

In contrast to the strict equality operator ===, the function distinguishes between +0 and -0 and treats NaNs as the same value.

var bool = ( 0.0 === -0.0 );
// returns true

bool = isSameValuef( 0.0, -0.0 );
// returns false

bool = isSameValuef( -0.0, -0.0 );
// returns true

bool = ( NaN === NaN );
// returns false

bool = isSameValuef( NaN, NaN );
// returns true

Notes

The function implements the SameValue Algorithm as specified in ECMAScript 5.

Examples

var toFloat32 = require( '@stdlib/number/float64/base/to-float32' );
var isSameValuef = require( '@stdlib/number/float32/base/assert/is-same-value' );

var bool = isSameValuef( toFloat32( 3.14 ), toFloat32( 3.14 ) );
// returns true

bool = isSameValuef( toFloat32( 0.0 ), toFloat32( 0.0 ) );
// returns true

bool = isSameValuef( toFloat32( -0.0 ), toFloat32( 0.0 ) );
// returns false

bool = isSameValuef( toFloat32( NaN ), toFloat32( NaN ) );
// returns true

C APIs

Usage

#include "stdlib/number/float32/base/assert/is_same_value.h"

stdlib_base_float32_is_same_value( a, b )

Tests if two single-precision floating-point numbers a and b are the same value.

#include <stdbool.h>

bool v = stdlib_base_float32_is_same_value( 3.14f, 3.14f );
// returns true

v = stdlib_base_float32_is_same_value( 0.0f, -0.0f );
// returns false

The function accepts the following arguments:

a: [in] float first input value.
b: [in] float second input value.

bool stdlib_base_float32_is_same_value( const float a, const float b );

Examples

#include "stdlib/number/float32/base/assert/is_same_value.h"
#include <stdbool.h>
#include <stdio.h>

int main( void ) {
    const float a[] = {
        5.0f,
        -2.0f,
        0.0f,
        0.0f/0.0f
    };
    const float b[] = {
        5.0f,
        2.0f,
        -0.0f,
        0.0f/0.0f
    };

    bool v;
    int i;
    for ( i = 0; i < 4; i++ ) {
        v = stdlib_base_float32_is_same_value( a[ i ], b[ i ] );
        printf( "Same value? %s\n", ( v ) ? "True" : "False" );
    }
}