java计算器综合程序

以下是一个简单的Java计算器综合程序，可以进行基本的加减乘除运算和清零操作。

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.print("Enter the first number: ");
        num1 = input.nextDouble();

        System.out.print("Enter an operator (+, -, *, /): ");
        operator = input.next().charAt(0);

        System.out.print("Enter the second number: ");
        num2 = input.nextDouble();

        switch (operator) {
            case '+':
                result = num1 + num2;
                System.out.println(num1 + " + " + num2 + " = " + result);
                break;
            case '-':
                result = num1 - num2;
                System.out.println(num1 + " - " + num2 + " = " + result);
                break;
            case '*':
                result = num1 * num2;
                System.out.println(num1 + " * " + num2 + " = " + result);
                break;
            case '/':
                if (num2 == 0) {
                    System.out.println("Error: division by zero");
                } else {
                    result = num1 / num2;
                    System.out.println(num1 + " / " + num2 + " = " + result);
                }
                break;
            default:
                System.out.println("Invalid operator");
                break;
        }

        input.close();
    }
}

这个程序要求用户输入两个数字和一个运算符，然后根据运算符执行相应的计算，并输出结果。如果输入的运算符不是加、减、乘或除，则输出“Invalid operator”。如果进行除法运算时除数为零，则输出“Error: division by zero”。用户可以重复执行这个计算器程序，直到退出程序。