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@stdlib/math-base-assert-is-integer

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@stdlib/math-base-assert-is-integer

Test if a finite double-precision floating-point number is an integer.


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About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

isInteger

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Test if a finite double-precision floating-point number is an integer.

Installation

npm install @stdlib/math-base-assert-is-integer

Usage

var isInteger = require( '@stdlib/math-base-assert-is-integer' );
isInteger( x )

Tests if a finite double-precision floating-point number is an integer.

var bool = isInteger( 1.0 );
// returns true

Notes

  • The function assumes a finite number. If provided positive or negative infinity, the function will return true, when, in fact, the result is undefined. If x can be infinite, wrap the implementation as follows:

    function check( x ) {
        return (
            x < Infinity &&
            x > -Infinity &&
            isInteger( x )
        );
    }
    
    var bool = check( Infinity );
    // returns false
    
    bool = check( -Infinity );
    // returns false
    

Examples

var isInteger = require( '@stdlib/math-base-assert-is-integer' );

var bool = isInteger( -5.0 );
// returns true

bool = isInteger( 3.14 );
// returns false

bool = isInteger( NaN );
// returns false

C APIs

Usage

#include "stdlib/math/base/assert/is_integer.h"
stdlib_base_is_integer( x )

Tests if a finite double-precision floating-point number is an integer.

bool out = stdlib_base_is_integer( 1.0 );
// returns true

out = stdlib_base_is_integer( 3.14 );
// returns false

The function accepts the following arguments:

  • x: [in] double input value.
bool stdlib_base_is_integer( const double x );

Examples

#include "stdlib/math/base/assert/is_integer.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

int main( void ) {
    double x;
    bool v;
    int i;
    
    for ( i = 0; i < 100; i++ ) {
        x = ( ( (double)rand() / (double)RAND_MAX ) * 100.0 ) - 50.0;
        v = stdlib_base_is_integer( x );
        printf( "x = %lf, is_integer(x) = %s\n", x, ( v ) ? "true" : "false" );
    }
}

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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License

See LICENSE.

Copyright © 2016-2024. The Stdlib Authors.

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Last updated on 04 Mar 2024

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