Floor

Round a double-precision floating-point number toward negative infinity.

Usage

var floor = require( '@stdlib/math/base/special/floor' );

floor( x )

Rounds a double-precision floating-point number toward negative infinity.

var v = floor( -4.2 );
// returns -5.0

v = floor( 9.99999 );
// returns 9.0

v = floor( 0.0 );
// returns 0.0

v = floor( NaN );
// returns NaN

Examples

var randu = require( '@stdlib/random/base/randu' );
var floor = require( '@stdlib/math/base/special/floor' );

var x;
var i;

for ( i = 0; i < 100; i++ ) {
    x = (randu()*100.0) - 50.0;
    console.log( 'floor(%d) = %d', x, floor( x ) );
}

C APIs

Usage

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

stdlib_base_floor( x )

Rounds a double-precision floating-point number toward negative infinity.

double y = stdlib_base_floor( 3.14 );
// returns 3.0

The function accepts the following arguments:

x: [in] double input value.

double stdlib_base_floor( const double x );

Examples

#include "stdlib/math/base/special/floor.h"
#include <stdio.h>

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

    double y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        y = stdlib_base_floor( x[ i ] );
        printf( "floor(%lf) = %lf\n", x[ i ], y );
    }
}