rational.java

设计rational类

/*
 * Created on 2007-4-17
 *
 * TODO To change the template for this generated file go to
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 */

/**
 * @author hulmous
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class Rational {
	int numerator;
	int denominator;
	public Rational(){
		numerator=0;
		denominator=1;
	}
	public Rational(int a){
		numerator=a;
		denominator=1;
	}
	public Rational(int a,int b){
		if(b<0)
		{
			a=-a;
			b=-b;
		}
		numerator=a;
		denominator=b;
	}
	void show(){
		System.out.println("The answer is:"+numerator+"/"+denominator);
	}
	public Rational add(Rational b){
		int x=(numerator*b.denominator)+(b.numerator*denominator);
		int y=denominator*b.denominator;
		return new Rational(x,y);
	}
	public Rational sub(Rational b){
		int x=(numerator*b.denominator)-(b.numerator*denominator);
		int y=denominator*b.denominator;
		return new Rational(x,y);
	}
	public Rational mutil(Rational b){
		int x=numerator*b.numerator;
		int y=denominator*b.denominator;
		return new Rational(x,y);
	}
	public Rational devide(Rational b){
		int x=numerator*b.denominator;
		int y=denominator*b.numerator;
		return new Rational(x,y);
	}
	boolean equal(Rational b){
		return (denominator*b.numerator==numerator*b.denominator)?true:false;
	}
	boolean less(Rational b){
		return (denominator*b.numerator<numerator*b.denominator)?true:false;
	}
}