toInt32

Convert a double-precision floating-point number to a signed 32-bit integer.

Usage

var float64ToInt32 = require( '@stdlib/number/float64/base/to-int32' );

float64ToInt32( x )

Converts a double-precision floating-point number to a signed 32-bit integer.

var y = float64ToInt32( 4294967295.0 );
// returns -1

y = float64ToInt32( 3.14 );
// returns 3

y = float64ToInt32( -3.14 );
// returns -3

y = float64ToInt32( NaN );
// returns 0

y = float64ToInt32( Infinity );
// returns 0

y = float64ToInt32( -Infinity );
// returns 0

Examples

var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var MAX_INT = require( '@stdlib/constants/math/uint32-max' );
var float64ToInt32 = require( '@stdlib/number/float64/base/to-int32' );

var int32;
var f64;
var i;

for ( i = 0; i < 500; i++ ) {
    // Generate a random double-precision floating-point integer:
    f64 = round( randu()*MAX_INT );

    // Convert the double-precision floating-point integer to a signed integer:
    int32 = float64ToInt32( f64 );

    console.log( 'float64: %d => int32: %d', f64, int32 );
}