JAVA 分数类

Description

设计一个分数类，分数的分子和分母用两个整型数表示，类中定义方法能够对分数进行加法、减法、乘法和除法运算。定义分数类的对象，进行运算并输出结果。

Input

输入不定组数的多组数据，每组一行，一行中第一个数据是字符串，"ADD"表示分数相加，"SUB"表示相减，"MUL"表示相乘，"DIV"表示相除。 然后是第一个分数的分子、分母，然后是第二个分数的分子和分母。中间用空格分隔。

Output

针对每组输入，有一行输出，第一个为运算后的分数的分子，第二个为分母。  要求：分子和分母要互质，如果是整数，分母为1 。中间用'/'分隔。参见样例

Sample Input

ADD 1 2 1 3 SUB 1 2 1 3 MUL 1 2 1 3   DIV 1 2 1 3 SUB 2 3 1 3

Sample Output

5/6 1/6 1/6 3/2 1/3 import java.*; import java.util.Scanner; class Fenshu {   private long molecular;// 分子   private long denominator;// 分母   public long getMolecular() {   return molecular;   }   public long getDenominator() {   return denominator;   }   public Fenshu(long molecular, long denominator) {   this.molecular = molecular;   if (denominator == 0) {   System.out.print("分母不能为零");   } else {   this.denominator = denominator;   }   gaibian();   }     private Fenshu gaibian() {   long gcd = this.gYueShu(this.molecular, this.denominator);   this.molecular /= gcd;   this.denominator /= gcd;   return this;   }   private static long gYueShu(long a, long b) {   while (b != 0) {   long temp = a % b;   a = b;   b = temp;   }   long gyueshu = a;   return gyueshu;   }    public Fenshu ADD(Fenshu fenShu) {    return new Fenshu(this.molecular * fenShu.denominator + fenShu.molecular * this.denominator, this.denominator * fenShu.denominator);   }   public Fenshu SUB(Fenshu fenShu) {   return new Fenshu(this.molecular * fenShu.denominator - fenShu.molecular * this.denominator, this.denominator * fenShu.denominator);   }   public Fenshu MUL(Fenshu fenShu) {   return new Fenshu(this.molecular * fenShu.molecular, this.denominator * fenShu.denominator);   }   public Fenshu DIV(Fenshu fenShu){   return new Fenshu(this.molecular*fenShu.denominator, this.denominator*fenShu.molecular);   }   public String toString() {   return molecular + "/" + denominator;  }  } public class Main { public static void main(String agrs[]) { Scanner cin = new Scanner(System.in); while(cin.hasNext()) { int a,b,c,d; String x; x=cin.next(); a=cin.nextInt(); b=cin.nextInt(); c=cin.nextInt(); d=cin.nextInt(); Fenshu s1 = new Fenshu(a,b); Fenshu s2 = new Fenshu(c,d); if(x.charAt(0)=='A') { System.out.println(s1.ADD(s2)); } if(x.charAt(0)=='S') { System.out.println(s1.SUB(s2)); } if(x.charAt(0)=='M') { System.out.println(s1.MUL(s2)); } if(x.charAt(0)=='D') { System.out.println(s1.DIV(s2)); } } } }