html中的特殊符號表示法

阿新 • • 發佈：2021-09-19

1.給出你的有理數類的程式碼。

package test1;

public class Rational {
    
    private int Numerator;//分子
    private int Denominator;//分母
    
    public Rational(int Numerator, int Denominator) {    //建構函式
        this.Numerator=Numerator;
        this.Denominator=Denominator;
    }

    public int getNumerator() {    //獲取分子
        return Numerator;
    }

    public void setNumerator(int numerator) {
        Numerator = numerator;
    }

    public int getDenominator() {    //獲取分母
        return Denominator;
    }

    public void setDenominator(int denominator) {
        Denominator = denominator;
    }
    
    public    Rational addition(Rational X) {    //加法
        int a=this.Numerator*X.Denominator+X.Numerator*this.Denominator;
        int b=this.Denominator*X.Denominator;
        return new Rational(a,b);
    }
    
    public    Rational subtraction(Rational X) {    //減法
        int a=this.Numerator*X.Denominator-X.Numerator*this.Denominator;
        int b=this.Denominator*X.Denominator;
        return new Rational(a,b);
    }
    
    public    Rational multiplication(Rational X) {    //乘法
        int a=this.Numerator*X.Numerator;
        int b=this.Denominator*X.Denominator;
        return new Rational(a,b);
    }
    
    public    Rational division(Rational X) {    //除法
        int a=this.Numerator*X.Denominator;
        int b=this.Denominator*X.Numerator;
        return new Rational(a,b);
    }
    
    public int compareTo(Rational X) {    //比較大小
        if(this.subtraction(X).getNumerator()>0)
            return 1;//大於
        else if(this.subtraction( X).getNumerator()==0)
            return 0;//等於
        else
            return -1;//小於
    }
    
    public String toString() {    //轉換成String型，輸出Rational類預設轉換為該型
        if(this.Denominator==1)
            return this.Numerator+" ";
        else
            return this.Numerator+"/"+this.Denominator;
    }
    
    public double doubleValue() {    //轉換成double型
        return 1.0*this.Numerator/this.Denominator;
    }
    
    public int intValue() {    //轉換成int型
        return (int)doubleValue();
    }
    
    public long longValue() {    //轉換成long型
        return (long)doubleValue();
    }
    
}

2.給出你的測試程式碼。要在與有理數類不同包的其他類中呼叫有理數類。

package test1;

import java.util.ArrayList;
import java.util.Scanner;
import java.util.Arrays;
import java.util.List;
import java.math.BigDecimal;
import test1.Rational;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("輸入兩個數字構成有理數分數");
        Rational a = new Rational(in.nextInt(), in.nextInt());
        System.out.println("輸入兩個數字構成有理數分數");
        Rational b = new Rational(in.nextInt(), in.nextInt());
        System.out.println("兩個有理數相加結果");
        System.out.println(a.addition(b));
        System.out.println("兩個有理數相減結果");
        System.out.println(a.subtraction(b));
        System.out.println("兩個有理數相乘結果");
        System.out.println(a.multiplication(b));
        System.out.println("兩個有理數相除結果");
        System.out.println(a.division(b));
        System.out.println("比較兩個有理數大小結果：大於輸出1，等於輸出0，小於輸出-1");
        System.out.println(a.compareTo(b));
        System.out.println("將第一個有理數轉換成字串型");
        System.out.println(a.toString());
        System.out.println("將第一個有理數轉換成double型");
        System.out.println(a.doubleValue());
        System.out.println("將第一個有理數轉換成int型");
        System.out.println(a.intValue());
        System.out.println("將第一個有理數轉換成long型");
        System.out.println(a.longValue());
    }

}