java类j进行分数运算_java第二周作业--实现分数的四则运算

3.在任务1的基础上实现分数的四则运算，即两个分数相减，相乘和相除，要考虑到各种边界情况。

package ou;

import java.util.*;

public class Gongys {

public static void main(String[] args) {

caidan cai=new caidan();

Scanner sca=new Scanner(System.in);

System.out.println("请输入选择：");

int c=sca.nextInt();

switch(c)

{

case 1:jia();break;

case 2:jian();break;

case 3:cheng();break;

case 4:chu();break;

default :break;

}

}

public static void jia()

{

Scanner sca=new Scanner(System.in);

System.out.println("请输入第一个数的分母分子m1,m4,");

double m1=sca.nextDouble();//分母

if(m1==0)

{

System.out.println("分母不能为0！");

}

double m4=sca.nextDouble();//

System.out.println("请输入第二个数的分母分子n1,n4,");

double n1=sca.nextDouble();

double n4=sca.nextDouble();

double a=GYS( m1, n1);

double m2=(m1*n1)/a;

double m3,n3;//最小公倍数/m1,n1

m3=m2/m1;//得到分子的倍数

n3=m2/n1;

System.out.println("请输入");

double m6=n4*n3+m4*m3;

double b;

b=GYS( m6, m2);

System.out.println(m4+"/"+m1+"+"+n4+"/"+n1+"="+m6/b+"/"+m2/b);

}

public static void jian()

{

Scanner sca=new Scanner(System.in);

System.out.println("请输入第一个数的分母分子m1,m4,");

double m1=sca.nextDouble();//分母

double m4=sca.nextDouble();//

if(m1==0)

{

System.out.println("分母不能为0！");

}

System.out.println("请输入第二个数的分母分子n1,n4,");

double n1=sca.nextDouble();

double n4=sca.nextDouble();

double a=GYS( m1, n1);

double m2=(m1*n1)/a;

double m3,n3;//最小公倍数/m1,n1

m3=m2/m1;//得到分子的倍数

n3=m2/n1;

System.out.println("请输入");

double m6=m4*m3-n4*n3;

double b;

b=GYS( m6, m2);

System.out.println(b);

System.out.println(m4+"/"+m1+"-"+n4+"/"+n1+"="+m6/b+"/"+m2/b);

}

public static void cheng()

{

Scanner sca=new Scanner(System.in);

System.out.println("请输入第一个数的分母分子m1,m4,");

double m1=sca.nextDouble();//分母

double m4=sca.nextDouble();//分子

if(m1==0)

{

System.out.println("分母不能为0！");

}

System.out.println("请输入第二个数的分母分子n1,n4,");

double n1=sca.nextDouble();//分母

double n4=sca.nextDouble();//分子

double b= GYS( m1*n1, m4*n4);

double m2,n2;

m2= (m1*n1)/b;

n2=(m4*n4)/b;

System.out.println(m4+"/"+m1+"乘以"+n1+"/"+n4+"="+n2+"/"+m2);

}

public static void chu()

{

Scanner sca=new Scanner(System.in);

System.out.println("请输入第一个数的分母分子m1,m4,");

double m1=sca.nextDouble();//分母

double m4=sca.nextDouble();//分子

if(m1==0)

{

System.out.println("分母不能为0！");

}

System.out.println("请输入第二个数的分母分子n1,n4,");

double n1=sca.nextDouble();//分母

double n4=sca.nextDouble();//分子

double b= GYS( m1*n4, m4*n1);

double m2,n2;

m2= (m1*n4)/b;

n2=(m4*n1)/b;

System.out.println(m4+"/"+m1+"除以"+n1+"/"+n4+"="+n2+"/"+m2);

}

//求最大公约数

public static double GYS(double m,double n)

{

double temp=1;

while(temp!=0)

{

temp=m%n;

m=n;

n=temp;

}

return m;

}

}

class XT

{

public XT()

{

Scanner sca=new Scanner(System.in);

System.out.println("请输入第一个数的分母分子m1,m4,");

double m1=sca.nextDouble();//分母

if(m1==0)

{

System.out.println("分母不能为0！");

}

double m4=sca.nextDouble();//

System.out.println("请输入第二个数的分母分子n1,n4,");

double n1=sca.nextDouble();

double n4=sca.nextDouble();

}

}

class caidan

{

public caidan()

{

System.out.println("----------------------菜单----------------------");

System.out.println(" 1.分数相加");

System.out.println(" 2.分数相减");

System.out.println(" 3.分数相乘");

System.out.println(" 4.分数相除");

System.out.println("------------------------------------------------");

}

}