/**
 *  @author  Hank Dolben
 *  @version 2004 Mar 25
 *
 *  fnPad: a functional programming style calculator
 *  Copyright (c) 2001-2004 by Hank Dolben, All Rights Reserved
 */

/**
 *  a fnPad cosine Function
 */
public class cos extends org.dolben.fn.Function {
    
    /**
     *  makes an object that calculates the cosine of its argument
     */
    public cos( ) {
        super(1);
    }
    
    /**
     *  calculates the cosine of the zeroth argument
     *
     *  @return cosine
     *
     *  @throws Exception when argument is not a Number
     */
    protected Object evaluate( ) throws Exception {
        return new Double(Math.cos(getDouble(0)));
    }

}