一、首悉宽瞎先弄清公式：S(面积)=a(长)×b(宽)；这应该是最简单的公式了。
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二、明确输巧铅入，既然是求面积，必须知道长和宽，把它们作为输入项。
三、睁空模块划分：计算过程封装到函数int RecArea(int rec_length, int rec_width);
四、实现如下：
#include stdlib.h
#include stdio.h
// 计算矩形面积
int RecArea(int rec_length, int rec_width)
{
int rec_area = 0;
rec_area = rec_length*rec_width;
return rec_area;
}
int main()
{
int length, width, area;
printf("输入矩形的长和宽(用逗号分隔）：");
scanf("%d,%d", length, width);
area = RecArea(length, width);
printf("矩形面积为：%d\n", area);
return 0;
}
参考这中厅迅个框架来写：
public static void main(String[] args) throws IOException {
Scanner input = new Scanner(System.in);
int exit = 5;
int answer;
do {
System.out.println("--------客户信息管理软件---------");
System.out.println("1 添加客户");
System.out.println("2 修改客户");
System.out.println("3 删除客户");
System.out.println("4 客户列表"卖此);
System.out.println("5 退出");
System.out.println();
System.out.println("请选择(1-5):");
try {
answer = input.nextInt();
} catch (NumberFormatException e) {
answer = -1;
}
if(answer == 1){//新增客户
System.out.println("--------添加客户---------");
System.out.print("编号:");
int id=input.nextInt();
System.out.print("姓名:");
String name=input.next();
System.out.print("性别:");
String gender=input.next();
System.out.print("年龄:");
int age=input.nextInt();
System.out.print("电话:");
String tel=input.next();
System.out.print("邮箱:");
String email=input.next();
Customer customer=new Customer(id,name,gender,age,tel,email);
//添加：
CustomerList.addCustomer(customer);
//插入伏高数据库
DBOperation.addCustomer(customer);
}
else if(answer == 2){//修改客户
System.out.println("--------修改客户---------");
System.out.print("请选择待修改客户编号(-1退出):");
int cid=input.nextInt();
Customer customer = new CustomerList().queryCustomer(cid);
System.out.print("姓名("+customer.getCostomerName()+"):");
String newName = input.next();
System.out.print("性别("+customer.getGender()+"):");
String newGender = input.next();
System.out.print("年龄("+customer.getAge()+"):");
int newAge = input.nextInt();
System.out.print("电话("+customer.getTel()+"):");
String newTel = input.next();
System.out.print("邮箱("+customer.getEmail()+"):");
String newEmail = input.next();
Customer newCustomer = new Customer(customer.getCustomerID(),newName,newGender,newAge,newTel,newEmail);
CustomerList.changeCustomer(newCustomer);
//数据库修改
DBOperation.changeCustomer(newCustomer);
}
else if(answer == 3){
System.out.println("--------删除客户---------");
System.out.print("请选择待删除客户编号(-1退出):");
int cid=input.nextInt();
System.out.print("确认是否删除(Y/N):");
String flag=input.next();
if("Y".equalsIgnoreCase(flag)){
CustomerList.delCustomer(cid);
//数据库删除
DBOperation.delCustomer(cid);
System.out.println("--------删除完成---------");
}
}
else if(answer == 4){
System.out.println("--------客户列表---------");
ListCustomer all = DBOperation.queryAllCustomer();
System.out.println("编号\t\t姓名\t\t性别\t\t年龄\t\t电话\t\t邮箱\t\t");
for(Customer customer:all){
System.out.print(customer.getCustomerID()+"\t\t"+customer.getCostomerName()+"\t\t"+customer.getGender()+"\t\t"+customer.getAge()+"\t\t"+customer.getTel()+"\t\t"+customer.getEmail()+"\n");
}
System.out.println("--------客户列表完成---------");
}else if(answer == 5){
System.out.println("欢迎下次使用!");
}
}while(answer != exit);
}
//计算矩形的面积
public class RectArea {
public static double getArea(double width, double higth) {
double area = 0.0;// 矩形面积
// 判断输滚敬入是否合理
if (!(width = 0 || higth = 0)) {
area = width * higth;
return area;// 返回面积
} else {
System.out.println("请输入合大态慎理的长宽");
return -1;
}
}
public static void main(String[] args) {
//测试 宽：10.0 高：闭空20.0
System.out.println("矩形面积" + RectArea.getArea(10.0, 20.0));
}
}
加点分,我帮你
算了,我给你写吧
放Ubuntu past了,有效期是1年:
网页链接
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import 山判javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
public class Square {
private JFrame frame;
private JTextField textField;
private JTextField textField_1;
private JTextField 逗培改textField_2;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Square window = new Square();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Square() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 235, 315);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
frame.setResizable(false);
JLabel label = new JLabel("长:");
label.setBounds(27, 31, 27, 41);
frame.getContentPane().add(label);
textField = new JTextField();
textField.setBounds(88, 39, 86, 24);
frame.getContentPane().add(textField);
textField.setColumns(10);
JLabel label_1 = new JLabel("宽:");
label_1.setBounds(27, 85, 27, 41);
frame.getContentPane().add(label_1);
textField_1 = new JTextField();
textField_1.setBounds(88, 93, 86, 24);
frame.getContentPane().add(textField_1);
textField_1.setColumns(10);
JLabel label_2 = new JLabel("面积:");
label_2.setBounds(27, 154, 43, 18);
frame.getContentPane().add(label_2);
textField_2 = new JTextField();
textField_2.setColumns(10);
textField_2.setBounds(88, 151, 86, 24);
frame.getContentPane().add(textField_2);
JButton button = new JButton("计算");
button.setBounds(46, 213, 113, 27);
frame.getContentPane().add(button);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
Double d1 = Double.valueOf(textField.getText());
Double 中锋d2 = Double.valueOf(textField_1.getText());
Double d3 = (int) (d1 * d2 * 1000 + 0.5) / 1000.0;
textField_2.setText(d3.toString());
} catch (Exception e2) {
// TODO: handle exception
textField_2.setText("请输入数字!");
}
}
});
}
}