我希望我的程序一次又一次地运行而不会停止

import java.util.*;
public class bad {

        public static void main(String []args)
    {
            Scanner input;
            input = new Scanner(System.in);


        System.out.println("Enter First Num ");
        int a =input.nextInt();
        input.nextLine();

        System.out.println("Enter Secound Num ");
        int b =input.nextInt();
        input.nextLine();

        System.out.println("For Addition press a" );
        System.out.println("For Subtraction press s" );
        System.out.println("For Multiplication press m" );
        System.out.println("For Divide press d" );
        System.out.println("For Square and Cube press c" );
        //the Square and cube depend apone you wither you have to Square or cube.
        System.out.println("For Root press r");
        String store =input.nextLine();

        if (store .equals("a"))


    {

        System.out.print("Answear is: ");
        System.out.print(a+b);
    }
        else if(store .equals("m"))
    {
        System.out.print("Answear is: ");
        System.out.print(a*b);
    }

        else if(store .equals("d"))
    {   
        System.out.print("Answear is: ");
        System.out.print(a/b);
    }
        else if(store .equals("s"))
    {
        System.out.print("Answear is: ");
        System.out.print(a-b);
    }


        else if(store .equals("c"))
        {   

        System.out.println("Answear for the power is : ");
        System.out.print(Math.pow(a,b));
    }
        else if (store.equals("r"))
        {
            System.out.println("Answear is : ");
            System.out.println(Math.sqrt(a));
        }




        }
    }

我的程序不停地反复运行意味着该程序要求用户再次输入数字吗？有很多搜索但却没有得到基本的想法。也许while循环可以工作，但是两次使用它却没有得到它。