一些java小程序

//猜数字小游戏

import java.util.Scanner;

public class Caishuzi{

public static void main(String[] args){

System.out.println("请输入一个0到1000的数字");

int a = 456;

for(int b=1;b<=10;b++){

Scanner sc=new Scanner(System.in);

int i =sc.nextInt();

if(i>a){

System.out.println("您猜的数字小了,再大点");

}

if(i<a){< p="">

System.out.println("您猜的数字打了,再小点");

if(i==a){

System.out.println("恭喜您猜对了");

}

}

//简单计算器

import java.util.Scanner;

public class Compute{

public static void main(String[] args){

System.out.println("请输入您要计算的两个数字:");

Scanner sc=new Scanner(System.in);

double a=sc.nextDouble();

double b=sc.nextDouble();

System.out.println("请输入您的运算符:");

String s=sc.next();

char[] c = s.toCharArray();

switch((int)c[0]){

case 37:

System.out.println(a%b);

break;

case 42:

System.out.println(a*b);

break;

case 43:

System.out.println(a+b);

break;

case 45:

System.out.println(a-b);

break;

case 47:

System.out.println(a/b);

}

}

}

}

//打印菱形矩阵

import java.util.Scanner;

public class Lingxing{

public static void main(String[] args){

System.out.println("请输入您要打印的菱形矩阵阶数(奇数):");

Scanner sc = new Scanner(System.in);

int n = sc.nextInt();

for(int i=0;i<n;i++){< p="">

for(int j=0;j<n;j++){< p="">

if(i+j<=n/2-1

i-j>=n/2+1

j-i>=n/2+1

i+j>=3*n/2){

System.out.print(" ");

}

else{

System.out.print("*");

}

}

System.out.print("\n");

}

}

}

//判断那一年那个月有几天

import java.util.Scanner;

public class Nian{

public static void main(String[] args){

Scanner sc = new Scanner(System.in);

System.out.println("请输入指定年份:");

int n = sc.nextInt();

System.out.println("请输入指定月份:");

int y = sc.nextInt();

if(n/4==0){

if(y==2){

System.out.println("29");

}

if(y==1&&y==3&&y==5&&y==7&&y==8&&y==10&&y==12){

System.out.println("31");

}

else{

System.out.println(30);

}

}

else if(y==2){

System.out.println("28");

}

else{

System.out.println("30");

}

}

}

//

public class Tuzi{

public static void main(String[] args){

int sum=0;

int b=1;

for(int i=1;i<=20;i++){

System.out.println("第"+i+"年:");

if(i%2==1){

b+=sum;

System.out.println("一共有"+b+"只兔子");

}

else{

sum+=b;

System.out.println("一共有"+sum+"只兔子。");

}

}

}

}​

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