Question

java编程计算器（新手求解，急）

java编程计算器（新手求解，急）百度搜索出来的代码看不懂 不需要计算器界面 只要能算就行了 能不能教下

Answer 1

import java.util.Scanner;

public class Main {

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a,b;
        String op;
        a=sc.nextInt();
        b = sc.nextInt();
        op = sc.next();
        switch(op){
        case "+":
            System.out.println(a+b);
            break;
        case "-":
            System.out.println(a-b);
            break;
        case "*":
            System.out.println(a*b);
            break;
        case "/":
            if(b == 0)
                System.out.println("Divided by zero!");
            else
                System.out.println((float)a/b);
            break;
            default:
                System.out.println("Invalid operator");
        }
            
    }
}

追问

scanner sc 这个sc可以改成in嘛

追答

可以。

Answer 2

public static void main(String[] args) {
System.out.println("请输入第一个数：");
Scanner scanner1 = new Scanner(System.in);
double input1 = Double.parseDouble(scanner1.nextLine());

System.out.println("请输入符号：");
Scanner scanner3 = new Scanner(System.in);
String method = scanner3.nextLine();

System.out.println("请输入第二个数：");
Scanner scanner2 = new Scanner(System.in);
double input2 = Double.parseDouble(scanner2.nextLine());

double result = 0;
if (method.equals("+"))