20207周总结1

Posted 2022-12-13 cvems700

1.
//***树
package d731s01;

import java.util.Scanner;

public class aster

public static void main(String[] args)
	System.out.print("请输入星树的高度");
	Scanner scanner = new Scanner(System.in);
	int h =scanner.nextInt();
	for(int i =1;i<=h;i++)
		for(int k=0;k<=h-i;k++)
			System.out.print(" ");
		
		for(int j =1;j<=2*i-1;j++)
			
			System.out.print("*");
		
		System.out.println("");
		
	
	
	
	
	

2.
//练习（平均联系）
package d731s02;

import java.util.Scanner;

public class agetest

public static void main(String[] args)
	Scanner sc =new Scanner(System.in);
	int sum=0;
	double avg =0;
	boolean flag=true;
	for(int i=0;i<5;i++)
	System.out.printf("请输入第%s年纪：",i+1);
		int x =sc.nextInt();
		if(x<0||x>130)
			System.out.println("您输入有误，无法计算");
			flag =false;
			break;
		
	sum+=x;
	
	
	avg =sum/5;
	if(flag==true)System.out.println("平均年龄为："+avg);
	

3.
//平闰年练习
package d731s03;

import java.util.Scanner;

public class pr

public static void main(String[] args) 
	// TODO Auto-generated method stub

	Scanner sc =new Scanner(System.in);
	int years =1900;
	int num=0;

for(years=1900;years<=2050;years++)
int flag =0;
if(years%40)
flag =1;
if(years%1000)

		flag =2;
		if(years%400==0)flag =1;
	
	

if(flag==1)
	num++;
	System.out.print(years+" ");
	if(num%5==0)System.out.println("");
	
	

	

4.//顾客登入系统
package d731s04;

import java.util.Scanner;

public class Admincust

public static void main(String[] args) 
	// TODO Auto-generated method stub
	ShowMainpage();
	Scanner scanner =new Scanner(System.in);
	int x=scanner.nextInt();
	do
		
	switch(x)
	
	
	
	
	case 1:System.out.println("管理员登入中（登入过程省略）");
	System.out.println("");
	ShowMainpage();
	x=scanner.nextInt();
	break;
	case 2:System.out.println("顾客登入中（登入过程省略）");
	System.out.println("");
	ShowMainpage();
	x=scanner.nextInt();
	break;
	
	
	while(x!=3);
	
	System.out.println("系统退出");
	
	
	


//主显示函数
static void ShowMainpage()
	System.out.println("***********************");
	System.out.println("1.管理员"+"  "+"2.顾客"+"  "+"3.退出");
	System.out.println("***********************");
	System.out.println("请输入数字选择登入：");	

5.
//计算各种图形的面积
package d731s05;

import java.util.Scanner;

public class Calcarea
static double π =3.1415926;
public static void main(String[] args)
// TODO Auto-generated method stub
ShowMainPage();
Scanner scanner =new Scanner(System.in);
int x =scanner.nextInt();
do
switch(x)
case 1:
System.out.println("");
ShowRectangle();
ShowMainPage();
x =scanner.nextInt();
break;
case 2:
System.out.println("");
ShowTriangle();
ShowMainPage();
x =scanner.nextInt();
break;

		case 3:	
			System.out.println("");
			ShowCir();			
			ShowMainPage();
			x =scanner.nextInt();
			break;
		default: 
			System.out.println("输入有误");
			System.out.println("请重新输入:");
			x =scanner.nextInt();
			break;
		
	
	
	while(x!=4);
	System.out.println("系统退出");
	
	
	
	
	

static void ShowMainPage()
	System.out.println("计算面积");
	System.out.println("1.矩形\\t2.三角形 \\t3.圆\\t4.退出\\t");
	System.out.println("请选择数字对应的功能：");   	
 
static void ShowRectangle()
	System.out.println("请输入矩形的高");
	Scanner scanner =new Scanner(System.in);
	double w = scanner.nextDouble();
	System.out.println("请输入矩形的宽");
	double l = scanner.nextDouble();
	double sum = l*w;
	System.out.println("矩形的面积为:"+sum);

static void ShowCir()
	System.out.println("请输入圆的半径或直径");
	System.out.println("1.半径\\t\\t2.直径");
	Scanner scanner =new Scanner(System.in);
	int  flag =scanner.nextInt();
	double cirsum=0;
	double r=0.0;
	if(flag==1)
		System.out.println("请输入半径");
		r = scanner.nextDouble();
		cirsum = π*r*r;
		
	else
		System.out.println("请输入直径");
		r = scanner.nextDouble();
		cirsum = π*r*r/4;
	
	System.out.println("圆的面积为:"+cirsum);


static void ShowTriangle()
	System.out.println("请输入三角形的高");
	Scanner scanner =new Scanner(System.in);
	double w = scanner.nextDouble();
	System.out.println("请输入三角形的宽");
	double l = scanner.nextDouble();
	double sum = l*w/2;
	System.out.println("三角形的面积为:"+sum);