写一个计算器

Posted 2023-03-23 fifawas

public class Calculator 
    public static void main(String[] args) 
        //写一个计算器，要求实现加减乘除功能，并且能够循环接收新的数据，通过用户交互实现。
        //◆思路推荐:
        //写4个方法:加减乘除
        //利用循环+ switch进行用户交互
        //传递需要操作的两个数
        //输出结果
        boolean loop = true;
        Scanner scanner = new Scanner(System.in);
        while (loop) 
            System.out.println("请输入第一个数字:");
            double num1 = scanner.nextDouble();
            System.out.println("请输入第二个数字:");
            double num2 = scanner.nextDouble();
            System.out.println("请继续输入你要选择的：1 +; 2 -; 3 *; 4 /");
            String operator = scanner.next();

            double result = 0.0;
            switch (operator) 
                case "+":
                    result = add(num1, num2);
                    break;
                case "-":
                    result = sub(num1, num2);
                    break;
                case "*":
                    result = mul(num1, num2);
                    break;
                case "/":
                    if (num2 == 0) 
                        System.out.println("输入不能为零，请重新输入");
                        continue;
                    
                    result = div(num1, num2);
                    break;
                default:
                    System.out.println("输入错误，请重新输入");
                    continue;
            
            System.out.println("运算结果为" + result);
            System.out.println("继续输入请按Y，否则请按N");
            String input = scanner.next();
            if ("N".equalsIgnoreCase(input)) 
                loop = false;
            
        
        scanner.close();

    

    public static double add(double... numbers)//加法
        double result = numbers[0];
        for (int i = 1; i < numbers.length ; i++) 
            result += numbers[i];
        
        return result;
    

    public static double sub(double... numbers)//减法
        double result = numbers[0];
        for (int i = 1; i < numbers.length ; i++) 
            result -= numbers[i];
        
        return result;
    

    public static double mul(double... numbers)//乘法
        double result = numbers[0];
        for (int i = 1; i < numbers.length ; i++) 
            result *= numbers[i];
        
        return result;
    

    public static double div(double... numbers)//除法
        double result = numbers[0];
        for (int i = 1; i < numbers.length ; i++) 
            result /= numbers[i];
        
        return result;