yunsuan.java

JAVA的例子程序

import java.util.Random;
public class Yunsuan{
	String A;
    String chuti(int a,int b,String z){
	if (a!=0)
		{if (b>0)
		  A=a+"X"+"+"+b+"Y";
		else 
		  if (b<0 )
		      A=a+"X"+b+"Y";
		      else 
		        A=a+"X";}
	else 
	    {if (b!=0)
		  A=b+"X";
		else 
		  System.out.println(z +" not exist");
		 }
   return A;
		}
public static void main(String af[]){
	Random ran=new Random();
	int a1=ran.nextInt(20),b1=ran.nextInt(20),
	a2=ran.nextInt(20),b2=ran.nextInt(20);
	Yunsuan timu=new Yunsuan();
	char symble[]={'+','-'};
	for (int i=0;i<2;i++)
	{System.out.print("( "+timu.chuti(a1,b1,"Z1")+" )");
	System.out.print(symble[i]);
	System.out.print("( "+timu.chuti(a2,b2,"Z2")+" )");
	System.out.print("=");
	timu.select(symble[i],a1,b1,a2,b2);
	
	}
	    }
    void select (char j,int a1,int b1,int a2,int b2){
       	switch (j){
    	case '+':
    	     System.out.println(jiafa( a1, b1, a2, b2));
    	     break;
    	case '-':
    	     System.out.println(jianfa( a1, b1, a2, b2));
             break;
                }
        
         }
         
    String jiafa(int a1,int b1,int a2,int b2){
	    int a,b;
	    a=a1+a2;
	    b=b1+b2;
	   A= chuti(a,b,"no answer");
		return A;
		}
    String jianfa(int a1,int b1,int a2,int b2){
		int a,b;
	    a=a1-a2;
	    b=b1-b2;
	   A= chuti(a,b,"not answer");
		return A;
		}
	}