jiaogu.java

包括角谷,色子,回文等矿大JAVA实验课留的作文

package women;

import java.io.IOException;

public class Jiaogu {
	public static String readString()
	{
		int ch;
		String r="";
		boolean done=false;
		while(!done)
		try{
			ch=System.in.read();
			if(ch<0||ch==0xd)
				done=true;
			else
				r=r+(char)ch;
		
		}catch(IOException e)
		{ System.out.println("error");done=true; };
		
		return r;
	}
	
	
	
public static void main(String[] args)
{
int n,index;
String str;
System.out.println("请输入你想验证的正整数是否满足角谷猜想......");
str=readString();
index=Integer.parseInt(str);
while(index!=1)
{
	 if(index%2==0)
		 index=index/2;
	 else 
	     index=index*3+1;
}
if(index==1)   
  System.out.println("你所输入的正整数满足角谷猜想");
else
	System.out.println("你所输入的正整数不满足角谷猜想");
System.out.println("正在验证3到10000之间的正整数是否满足角谷猜想......");
for(int i=3;i<=10000;i++)
{
	index=i;
 while(index!=1)
 {
	 if(index%2==0)
		 index=index/2;
	 else 
	     index=index*3+1;
 }
 
}
System.out.println("3到10000之间的正整数都满足角谷猜想");

}
	
	
	
	
}