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

0.3.0 • Public • Published

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# isPositiveInteger

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

## Installation

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

## Usage

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

#### isPositiveInteger( x )

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

```var bool = isPositiveInteger( 1.0 );
// returns true

bool = isPositiveInteger( 0.0 );
// returns false

bool = isPositiveInteger( -10.0 );
// returns false```

## Notes

• The function assumes a finite `number`. If provided positive `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 &&
isPositiveInteger( x )
);
}

var bool = check( Infinity );
// returns false```

## Examples

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

var bool = isPositiveInteger( 5.0 );
// returns true

bool = isPositiveInteger( 0.0 );
// returns false

bool = isPositiveInteger( -1.0 );
// returns false

bool = isPositiveInteger( 3.14 );
// returns false

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

## C APIs

### Usage

`#include "stdlib/math/base/assert/is_positive_integer.h"`

#### stdlib_base_is_positive_integer( x )

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

```#include <stdbool.h>

bool out = stdlib_base_is_positive_integer( 3.0 );
// returns true

out = stdlib_base_is_positive_integer( -4.0 );
// returns false```

The function accepts the following arguments:

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

### Examples

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

int main( void ) {
const double x[] = { 5.0, -5.0, 3.14, -3.14, 0.0, 0.0/0.0 };

bool b;
int i;
for ( i = 0; i < 6; i++ ) {
b = stdlib_base_is_positive_integer( x[ i ] );
printf( "Value: %lf. Is positive integer? %s.\n", x[ i ], ( b ) ? "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.

## Package Sidebar

### Install

`npm i @stdlib/math-base-assert-is-positive-integer`

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