做一个计算器的源代码

以下是一个简单的 Python 计算器的源代码：

# 计算器程序

# 定义函数，进行加减乘除运算
def calculate(operator, num1, num2):
    if operator == '+':
        return num1 + num2
    elif operator == '-':
        return num1 - num2
    elif operator == '*':
        return num1 * num2
    elif operator == '/':
        return num1 / num2
    else:
        return "无效的运算符"

# 用户输入
num1 = float(input("请输入第一个数字: "))
operator = input("请输入运算符(+、-、*、/): ")
num2 = float(input("请输入第二个数字: "))

# 调用函数并输出结果
result = calculate(operator, num1, num2)
print("结果是:", result)

相关问题

用java做计算器源代码

请见下方Java代码：

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        double num1, num2, result;
        char operator;

        System.out.println("请输入第一个数字:");
        num1 = input.nextDouble();

        System.out.println("请输入运算符(+、-、*、/):");
        operator = input.next().charAt(0);

        System.out.println("请输入第二个数字:");
        num2 = input.nextDouble();

        switch (operator) {
            case '+':
                result = num1 + num2;
                System.out.println("结果为：" + result);
                break;

            case '-':
                result = num1 - num2;
                System.out.println("结果为：" + result);
                break;

            case '*':
                result = num1 * num2;
                System.out.println("结果为：" + result);
                break;

            case '/':
                if (num2 == 0) {
                    System.out.println("除数不能为零！");
                } else {
                    result = num1 / num2;
                    System.out.println("结果为：" + result);
                }
                break;

            default:
                System.out.println("运算符输入有误！");
                break;
        }
    }
}

这个计算器可以进行加、减、乘、除运算，运行程序后，根据提示输入两个数字和运算符，即可得到结果。

eclipse做计算器源代码下载

以下是一个简单的计算器程序的 Java 源代码，可以在 Eclipse 中进行编译和运行：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;
    private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9;
    private JButton buttonAdd, buttonSub, buttonMul, buttonDiv, buttonClear, buttonEquals;
    private JTextField textField;

    private double num1 = 0;
    private double num2 = 0;
    private char operator;

    public Calculator() {
        setTitle("Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 300);
        setResizable(false);

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

        textField = new JTextField();
        textField.setEditable(false);

        button7 = new JButton("7");
        button8 = new JButton("8");
        button9 = new JButton("9");
        buttonDiv = new JButton("/");
        button4 = new JButton("4");
        button5 = new JButton("5");
        button6 = new JButton("6");
        buttonMul = new JButton("*");
        button1 = new JButton("1");
        button2 = new JButton("2");
        button3 = new JButton("3");
        buttonSub = new JButton("-");
        button0 = new JButton("0");
        buttonClear = new JButton("C");
        buttonEquals = new JButton("=");
        buttonAdd = new JButton("+");

        panel.add(button7);
        panel.add(button8);
        panel.add(button9);
        panel.add(buttonDiv);
        panel.add(button4);
        panel.add(button5);
        panel.add(button6);
        panel.add(buttonMul);
        panel.add(button1);
        panel.add(button2);
        panel.add(button3);
        panel.add(buttonSub);
        panel.add(button0);
        panel.add(buttonClear);
        panel.add(buttonEquals);
        panel.add(buttonAdd);

        button0.addActionListener(this);
        button1.addActionListener(this);
        button2.addActionListener(this);
        button3.addActionListener(this);
        button4.addActionListener(this);
        button5.addActionListener(this);
        button6.addActionListener(this);
        button7.addActionListener(this);
        button8.addActionListener(this);
        button9.addActionListener(this);
        buttonClear.addActionListener(this);
        buttonAdd.addActionListener(this);
        buttonSub.addActionListener(this);
        buttonMul.addActionListener(this);
        buttonDiv.addActionListener(this);
        buttonEquals.addActionListener(this);

        setLayout(new BorderLayout());
        add(textField, BorderLayout.NORTH);
        add(panel, BorderLayout.CENTER);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == button0) {
            textField.setText(textField.getText() + "0");
        } else if (e.getSource() == button1) {
            textField.setText(textField.getText() + "1");
        } else if (e.getSource() == button2) {
            textField.setText(textField.getText() + "2");
        } else if (e.getSource() == button3) {
            textField.setText(textField.getText() + "3");
        } else if (e.getSource() == button4) {
            textField.setText(textField.getText() + "4");
        } else if (e.getSource() == button5) {
            textField.setText(textField.getText() + "5");
        } else if (e.getSource() == button6) {
            textField.setText(textField.getText() + "6");
        } else if (e.getSource() == button7) {
            textField.setText(textField.getText() + "7");
        } else if (e.getSource() == button8) {
            textField.setText(textField.getText() + "8");
        } else if (e.getSource() == button9) {
            textField.setText(textField.getText() + "9");
        } else if (e.getSource() == buttonClear) {
            num1 = 0;
            num2 = 0;
            operator = ' ';
            textField.setText("");
        } else if (e.getSource() == buttonAdd) {
            num1 = Double.parseDouble(textField.getText());
            operator = '+';
            textField.setText("");
        } else if (e.getSource() == buttonSub) {
            num1 = Double.parseDouble(textField.getText());
            operator = '-';
            textField.setText("");
        } else if (e.getSource() == buttonMul) {
            num1 = Double.parseDouble(textField.getText());
            operator = '*';
            textField.setText("");
        } else if (e.getSource() == buttonDiv) {
            num1 = Double.parseDouble(textField.getText());
            operator = '/';
            textField.setText("");
        } else if (e.getSource() == buttonEquals) {
            num2 = Double.parseDouble(textField.getText());
            double result = 0;
            switch (operator) {
                case '+':
                    result = num1 + num2;
                    break;
                case '-':
                    result = num1 - num2;
                    break;
                case '*':
                    result = num1 * num2;
                    break;
                case '/':
                    result = num1 / num2;
                    break;
            }
            textField.setText(Double.toString(result));
        }
    }

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

在 Eclipse 中创建一个新的 Java 项目，将上述代码复制并粘贴到一个名为 `Calculator.java` 的新类中。然后，使用 Eclipse 中的菜单选项进行编译和运行即可。