function int2wordsEN( num, out ) {
	var word;
	var rem;
	var i;
	if ( num === 0 ) {
		// Case: We have reached the end of the number and the number is zero.
		return out || 'zero';
	}
	if ( num < 0 ) {
		out += 'minus';
		num *= -1;
	}
	if ( num < 20 ) {
		rem = 0;
		word = ONES[ num ];
	}
	else if ( num < 100 ) {
		rem = num % 10;
		word = TENS[ floor( num / 10 ) ];
		if ( rem > 0 ) {
			word += '-' + ONES[ rem ];
			rem = 0;
		}
	}
	else {
		for ( i = 3; i < UNITS.length - 1; i++ ) {
			if ( num < UNITS[ i ].VAL ) {
				rem = num % UNITS[ i-1 ].VAL;
				word = int2wordsEN( floor( num / UNITS[ i-1 ].VAL ), '' ) + ' ' + UNITS[ i-1 ].EN;
				break;
			}
		}
		if ( i === UNITS.length - 1 ) {
			rem = num % UNITS[ i-1 ].VAL;
			word = int2wordsEN( floor( num / UNITS[ i-1 ].VAL ), '' ) + ' ' + UNITS[ i-1 ].EN;
		}
	}
	if ( out.length > 0 ) {
		out += ' ';
	}
	out += word;
	return int2wordsEN( rem, out );
}
Converts a number to a word representation in English.

@private
@param {number} num - number to convert
@param {string} out - output string
@returns {string} word representation

@example
var words = int2wordsEN( 1234, '' );
// returns 'one thousand two hundred thirty-four'

@example
var words = int2wordsEN( -129, '' );
// returns 'minus one hundred twenty-nine'

@example
var words = int2wordsEN( 0, '' );
// returns 'zero'