isPrime

Test if a number is a prime.

A prime number is defined as an integer value greater than 1 which is only divisible by 1 and itself.

Usage

var isPrime = require( '@stdlib/math/base/assert/is-prime' );

isPrime( x )

Tests if a number is a prime.

var bool = isPrime( 7.0 );
// returns true

Examples

var isPrime = require( '@stdlib/math/base/assert/is-prime' );

var bool = isPrime( 11.0 );
// returns true

bool = isPrime( 3.14 );
// returns false

bool = isPrime( NaN );
// returns false

C APIs

Usage

#include "stdlib/math/base/assert/is_prime.h"

stdlib_base_is_prime( x )

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

#include <stdbool.h>

bool out = stdlib_base_is_prime( 11.0 );
// returns true

out = stdlib_base_is_prime( 3.14 );
// returns false

The function accepts the following arguments:

x: [in] double input value.

bool stdlib_base_is_prime( const double x );

Examples

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

int main( void ) {
    const double x[] = { 5.0, -5.0, 3.14, -3.14, -2.0, 2.0, 0.0, 0.0/0.0 };

    bool b;
    int i;
    for ( i = 0; i < 6; i++ ) {
        b = stdlib_base_is_prime( x[ i ] );
        printf( "Value: %lf. Is Prime? %s.\n", x[ i ], ( b ) ? "True" : "False" );
    }
}