java实践：小游戏：猜数字、判断回文数 。

import java.util.*;
public class caishuzi
{
public static void main (String args[ ])
{
System.out.println("给你一个1至100之间的整数,请猜测这个数");
int realNumber=(int)(Math.random()*100)+1;
int yourGuess=0;
Scanner reader=new Scanner(System.in);
System.out.println("输入您的猜测:");
yourGuess=reader.nextInt();
while ( yourGuess!=realNumber)
{

if (yourGuess>realNumber)
{
System.out.println("猜大了,请再猜:");
yourGuess=reader.nextInt();
}
else if(yourGuess<realNumber)
{
System.out.println("猜小了,请再猜:");
yourGuess=reader.nextInt();
}
}
System.out.println("猜对了!");
}
}

import java.util.*;
public class Number
{
public static void main(String args[])
{
int number=0;
int d5=0;
int d4=0;
int d3=0;
int d2=0;
int d1=0;
Scanner reader=new Scanner(System.in);
System.out.println("从键盘输入一个1至99999之间的数");
while(reader.hasNextInt())
{
number=reader.nextInt();
if(number>=1&&number<=99999)
{
d5=number%100000/10000;
d4=number%10000/1000;
d3=number%1000/100;
d2=number%100/10;
d1=number%10;
if(number>=10000&&number<=99999)
{
System.out.printf("\n%d是5位数", number);
if (d1==d5&&d2==d4)
{
System.out.printf("\t%d是回文数", number);
}
else
{
System.out.printf("\t%d不是回文数", number);
}
}
else if (number>=1000&&number<=9999)
{
System.out.printf("\n%d是4位数",number);
if (d1==d4&&d2==d3)
{
System.out.printf("\t%d是回文数", number);
}
else
{
System.out.printf("\t%d不是回文数",number);
}
}
else if (number>=100&&number<=999)
{
System.out.printf("\n%d是3位数", number);
if (d1==d3)
{
System.out.printf("\t%d是回文数", number);
}
else
{
System.out.printf("\t%d不是回文数", number);
}
}
else if(d2!=0)
{
System.out.printf("\n%d是2位数", number);
if(d1==d2)
{
System.out.printf("\t%d是回文数", number);
}
else
{
System.out.printf("\t%d不是回文数", number);
}
}
else if(d1!=0)
{
System.out.printf("\n%d是1位数", number);
System.out.printf("\t%d是回文数", number);
}

else
{
System.out.printf("\n%d不在1至99999之间", number);
}
System.out.printf("%n可继续输入整数, 或输入非整数结束程序%n");
}
}
System.out.println("你输出的数据不是整数");
}

}