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isInteger
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Test if a finite [double-precision floating-point number][ieee754] is an integer.
bash
npm install @stdlib/math-base-assert-is-integer
javascript
var isInteger = require( '@stdlib/math-base-assert-is-integer' );
#### isInteger( x )
Tests if a finite [double-precision floating-point number][ieee754] is an integer.
javascript
var bool = isInteger( 1.0 );
// returns true
infinity, the function will return true, when, in fact, the result is undefined. If x can be infinite, wrap the implementation as follows:
javascript
function check( x ) {
return (
x < Infinity &&
x > -Infinity &&
isInteger( x )
);
}
var bool = check( Infinity );
// returns false
bool = check( -Infinity );
// returns false
javascript
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
#include "stdlib/math/base/assert/is_integer.h"
#### stdlib_base_is_integer( x )
Tests if a finite [double-precision floating-point number][ieee754] is an integer.
c
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.
c
bool stdlib_base_is_integer( const double x );
c
#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" );
}
}
