isComposite

Test if a number is a composite.

A composite number is defined as a positive integer value greater than 1 which has at least one divisor other than 1 and itself (i.e., an integer value which can be formed by multiplying two smaller positive integers).

Usage

var isComposite = require( '@stdlib/math/base/assert/is-composite' );

isComposite( x )

Tests if a number is a composite.

var bool = isComposite( 4.0 );
// returns true

Examples

var isComposite = require( '@stdlib/math/base/assert/is-composite' );

var bool = isComposite( 4.0 );
// returns true

bool = isComposite( 7.0 );
// returns false

bool = isComposite( NaN );
// returns false

C APIs

Usage

#include "stdlib/math/base/special/is_composite.h"

stdlib_base_is_composite( x )

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

#include <stdbool.h>

bool out = stdlib_base_is_composite( 3.0 );
// returns false

The function accepts the following arguments:

x: [in] double input value.

bool stdlib_base_is_composite( const double x );

Examples

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

int main( void ) {
    const double x[] = { 0.0, 0.0/0.0, 1.0, -1.0 , 4.0 };

    bool r;
    int i;
    for ( i = 0; i < 5; i++ ) {
        r = stdlib_base_is_composite( x[ i ] );
        printf( "Value: %lf. Is Composite? %s.\n", x[ i ], ( r ) ? "True" : "False" );
    }
}