day2.2-练习

简易计算器

public class Demo03 {
    //一个简易计算器
    //定义加法
    public static double add(double a, double b){
        return a + b;
    }
    //定义减法
    public static double subduction(double a, double b){
        double resultSub = a - b;
        return resultSub;
    }
    //定义乘法
    public static double mul(double a , double b){
        double resultMul = a * b;
        return resultMul;
    }
    //定义除法
    public static double division(double a,double b){
        double resultDiv = a / b;
        return resultDiv;
    }

    public static void main(String[] args) {
        //使用switch循环实现
        //创建扫描对象
        Scanner scanner = new Scanner(System.in);
        //获取交互数字
        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("请输入您想进行的运算符号");
        String operation = scanner.next();
        switch(operation){
            case "+" :
                System.out.println(add(num1,num2));
                break;
            case"-":
                System.out.println(subduction(num1,num2));
                break;
            case"/":
                System.out.println(division(num1,num2));
                break;
            case"*":
                System.out.println(mul(num1,num2));
                break;
            default:
                System.out.println("您输入的为非法运算符");
                break;

        }


    }
}```