给出答案后如何重置程序

Question

我在指南的帮助下完成了三角形面积计算的基本代码。然后我添加了一些代码来让它更有趣，但我希望它在你得到结果后重置。我希望程序在使用有效值完成先前的计算后重置为“输入三角形的底数：”。如果它在 (x) 时间后重置会很好。只是我希望它在任务完成后按下虚拟计算器中的 C 按钮。代码：import java.util.Scanner;import java.util.Timer;import java.util.TimerTask;public class TriangleArea {static Scanner sc = new Scanner(System.in);public static void main(String[] args) {    //declare variables to hold the base and height    double base;    double height;    //Variables created. move on    System.out.print("Enter the triangle's base: ");    base = sc.nextDouble();    //Base has been declared and filled in    System.out.print("Enter the triangle's height: ");    height = sc.nextDouble();    //Both variables are filled in    double preArea = base * height;    //now we need to divide by 2    double Area = preArea / 2;    //There we go. All variables are done, area has been calculated.    System.out.println("The area of your triangle is: " + Area);    int Outcome;      if (Area <= 100) {          System.out.println("Triangle's area is small");      }      if (Area <= 300) {          System.out.println("Triangles size is medium");      }      if (Area >= 300) {          System.out.println("Triangle's area is big");      }      else {      }           } }

Answer 1

您想使用退出的 while 循环，例如，通过让用户输入“0”作为退出代码。您可以使用boolean初始化为 true 并在用户输入退出代码时设置为 false 的 。

import java.util.Scanner;

public class Main {

    static Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {

        boolean repeat = true;

        while (repeat) {

            // declare variables to hold the base and height

            double base;

            double height;

            // Variables created. move on

            System.out.print("Enter the triangle's base (enter 0 to exit): ");

            base = sc.nextDouble();

            if (base == 0) {

                repeat = false;

                break;

            }

            // Base has been declared and filled in

            System.out.print("Enter the triangle's height (enter 0 to exit): ");

            height = sc.nextDouble();

            if (height == 0) {

                repeat = false;

                break;

            }

            // Both variables are filled in

            double preArea = base * height;

            // now we need to divide by 2

            double Area = preArea / 2;

            // There we go. All variables are done, area has been calculated.

            System.out.println("The area of your triangle is: " + Area);

            if (Area <= 100) {

                System.out.println("Triangle's area is small");

            }

            if (Area <= 300) {

                System.out.println("Triangles size is medium");

            }

            if (Area >= 300) {

                System.out.println("Triangle's area is big");

            }

            else {

            }

        }

        System.out.println("Bye bye");

}

}

Answer 2

我认为你需要做

while (true){

    your code 

    if (exit condition){

        break;

    }

}

这样你的程序就会循环。