第一次作业

《软件集成开发环境》第一次作业

一、实验内容

1.设计一个可实现加、减、乘、除功能的计算器软件

2.使用牛顿迭代法完成算术开方的运算

3.将自己编写的算术开方功能集成到计算器程序中，使计算器软件除了具备加、减、乘、除功能外，还具备算术开方功能

二、实验要求

1.完成计算器软件的UI设计、使用Visio设计计算器软件中所涉及的流程图。

2.选择合适的集成开发环境和工具完成计算器软件的开发

3.将开发好软件进行测试并截图

4.将本次实验过程写成实验报告提交在本次作业的链接中

5.关键代码部分以代码块格式粘贴在实验报告正文中

三、具体实验步骤

1,画出流程图

2，根据流程图编写代码

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Calculator {

private JFrame frame; private JTextField textField;

private JButton btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btn0;

private JButton btnAdd, btnSubtract, btnMultiply, btnDivide, btnEquals, btnClear;

private double firstNumber; private String operator;

public Calculator() {

frame = new JFrame("Calculator");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(300, 400);

frame.setLayout(new BorderLayout());

textField = new JTextField();

textField.setHorizontalAlignment(JTextField.RIGHT);

JPanel panel = new JPanel();

panel.setLayout(new GridLayout(4, 4));

btn1 = new JButton("1");

btn2 = new JButton("2");

btn3 = new JButton("3");

btn4 = new JButton("4");

btn5 = new JButton("5");

btn6 = new JButton("6");

btn7 = new JButton("7");

btn8 = new JButton("8");

btn9 = new JButton("9");

btn0 = new JButton("0");

btnAdd = new JButton("+");

btnSubtract = new JButton("-");

btnMultiply = new JButton("*");

btnDivide = new JButton("/");

btnEquals = new JButton("=");

btnClear = new JButton("C");

panel.add(btn1);

panel.add(btn2);

panel.add(btn3);

panel.add(btnAdd);

panel.add(btn4);

panel.add(btn5);

panel.add(btn6);

panel.add(btnSubtract);

panel.add(btn7);

panel.add(btn8);

panel.add(btn9);

panel.add(btnMultiply);

panel.add(btn0);

panel.add(btnClear);

panel.add(btnEquals);

panel.add(btnDivide);

frame.add(textField, BorderLayout.NORTH);

frame.add(panel, BorderLayout.CENTER);

frame.setVisible(true);

btn1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText() + "1");

} });

btn2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e)

{

textField.setText(textField.getText() + "2"); } }); // 添加其他按钮的监听器

btnAdd.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

firstNumber = Double.parseDouble(textField.getText());

operator = "+"; textField.setText(""); }

});

btnEquals.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

double secondNumber = Double.parseDouble(textField.getText());

double result = 0;

if (operator.equals("+")) {

result = firstNumber + secondNumber;

} else if (operator.equals("-"))

{ result = firstNumber - secondNumber;

} else if (operator.equals("*"))

{ result = firstNumber * secondNumber;

} else if (operator.equals("/"))

{ result = firstNumber / secondNumber;

}

textField.setText(String.valueOf(result)); }

});

btnClear.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText("");

} });

} public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

public void run() { new Calculator();

} });

}}

我们使用的算法思想是牛顿迭代法Q Qpackage package1 ;

import java.util .Scanner ;

public class t010fx {

public static void main(String args[])Scanner S = new Scanner (System. in);

System . out . pr intln("请输入一个你想开方的值int C = s.nextInt( );

double x1 ,X0 = C;

double fx = 2*x0;

x1 = x0 - (x0*x0-c)/fx;

while(Math.abs(x1-x0)>1e-16){

x0 = x1;

x1 = x0 - (x0*x0-c)/fx;

}

System. out.println(C+"开方的结果是"+X1);}此时的运算结果如下: