java - 一个简单的控制台计算器

Question

我设计了一个简单的控制台计算器，如下所示，但我需要创建一个可以重新运行程序的循环:

这样我就不需要一次又一次地运行该程序，它可以接受用户的输入并自行运行。

private static Scanner op;
private static Scanner input;
private static Scanner cont;

public static void main(String args[]) {
    double num1;
    double num2;
    double ans = 0;
    double l1;
    double l2;
    String operation;

    input = new Scanner(System.in);
    System.out.println("Please input your first number:");
    num1= input.nextDouble();

    System.out.println("Please input the second numer:");
    num2= input.nextDouble();

    op = new Scanner(System.in);
    System.out.println("Select your operation:");
    operation = op.next();

    if (operation.equals("+")){
        System.out.println("Your Result is :" + (num1+num2));
    }
    if (operation.equals("-")){
        System.out.println("Your Result is:" + (num1-num2));
    }
    if (operation.equals("/")){
        if (num2 == 0){
            System.out.println("Your Input is Invalid");}
            else {
                System.out.println("Your result is :" + (num1/num2));
            }

        }
        if (operation.equals("*")){
            System.out.println("Your result is:" + (num1*num2));
        }
        if (operation.equals("%")){
           System.out.println("Your result is:" + (num1*100/num2));
        }
        if (operation.equals("^")){
            ans= Math.pow(num1, num2);
            System.out.println("Your result is:"+ans);
        }
        if (operation.equals("log")){
            l1=Math.log(num1);
            l2=Math.log(num2);
           System.out.println("Your result is:"+l1/l2);
        }
        operation = cont.next();
        System.out.println("Do you wish to perform any other operation?");
        if (operation.equals("Yes")){

        else{
            System.out.println("Thank You");
        }
    }
}

Answer 1

您可以创建一个函数并使用如下循环调用它:

private static void myfunction(){
    //put your code here
}

public static void main(String[] args) {
    //call your function until your condition is false
    while(myconditionistrue){
        myfunction();
    }
}

如果您想询问用户是否继续使用这种方式:

private static void myfunction() {
    //put your code here
}

public static void main(String[] args) {

    String exit;
    Scanner scan = new Scanner(System.in);
    do {
        //call your function or you can put all your code here
        myfunction();
        System.out.println("You want to continue? y : n :");
        exit = scan.next();
    } while (exit.equals("y"));
}