计算器

package com.method;

import java.util.Scanner;

public class demo04 {
    //计算器
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请输入数值1");
            double num1 = scanner.nextDouble();
            System.out.println("请输入符号");
            String c = scanner.next();
            System.out.println("请输入数值2");
            double num2 = scanner.nextDouble();

            switch (c){
                    case "+":
                        System.out.println(num1 + num2);
                        break;
                    case "-":
                        System.out.println(num1 - num2);
                        break;
                    case "*":
                        System.out.println(num1 * num2);
                        break;
                    case "/":
                        System.out.println(num1 / num2);
                        break;
                    default:
                        System.out.println("您输入有误");
                }
            }
        }
    }
法二：

import java.util.Scanner;

public class Zuoye1 {
public static void main(String[] args) {
Scanner s1 = new Scanner(System.in);
while (true) {
System.out.println("请输入第一个数字");
double num1 = s1.nextDouble();
System.out.println("请输入符号");
String num2 = s1.next();
System.out.println("请输入第二个数字");
double num3 = s1.nextDouble();
if (num2.equals("+")){
System.out.println("两个数的和= "+ (num1 + num3));
}else if (num2.equals("-")){
System.out.println("两个数的差= "+ (num1 - num3));
}else if (num2.equals("*")){
System.out.println("两个数的积= "+ (num1 * num3));
}else if (num2.equals("/")){
System.out.println("两个数的商= "+ (num1 / num3));
}
}
}
}

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