Java-在while循环的最后一行打印所有随机数

Question

I have the while loop running and processing properly. When the numbers that the user entered do not match the random number, the code prints out "Sorry ...(and proceeds to explain what the right number is)" each time the user is wrong. However, I cannot get the code to print out those same exact random numbers at the very end of the last loop before it terminates. Any suggestions?

   while (counter < 6)
        {
          counter++;
          System.out.println("Enter a number between 1-60: ");
          userInput = scan.nextInt();
          if (userInput > 60 || userInput < 1)
            System.out.println("Invalid input");

          int randomNumber = (int) (Math.random() * 60) + 1;
          if (userInput == randomNumber)
            System.out.println("Congrats, you have won!");
        else
          System.out.println("Sorry, you didn't choose the winning number." + "The winning number is " + randomNumber + ".");
        }

The bottom of the code has the winning number, but I want all of those same exact random numbers (which were randomized earlier) to show up at the end of the sixth loop. Also, the order of the user input does not influence the results. If the user chooses 1-13-8-34-56-2 and the computer had come up with 1-8-56-2-14-34…there would still be 5 matching numbers

Answer 1

otherwise you can store them in a string variable after casting them to string by doing this

  String randomNums = "";
  randomNums += randomNums +" - "+ String.ValueOf(randomNumber); 

Answer 2

i think it would be something like this, since you do not want store the numbers in an array or array list, you will have to work with string concatenation.

string keepValue="";
while (counter < 6)
        {
      counter++;
      System.out.println("Enter a number between 1-60: ");
      userInput = scan.nextInt();
      if (userInput > 60 || userInput < 1)
        System.out.println("Invalid input");

      int randomNumber = (int) (Math.random() * 60) + 1;
      keepValue=keepValue+randomNumber+"-";


      if (userInput == randomNumber)
        System.out.println("Congrats, you have won!");
    else
        System.out.println("Sorry, you didn't choose the winning number." + "The 
        winning number is " + randomNumber + ".");
    }
System.out.println(keepValue.substring(0, keepValue.length() - 1));

i hope this gives you an idea on how to solve it

Answer 3

Here is the piece of code, Just keep concating the random numbers with a string variable

import java.util.Scanner;
public class RandomNumbers{

     public static void main(String []args){
        int counter =0;
        int userInput=0;
        String userEntries="";
        String randomEntries="";
        Scanner scan=new Scanner(System.in);
        while (counter < 6)
        {
          counter++;
          System.out.println("Enter a number between 1-60: ");
          userInput = scan.nextInt();
          if (userInput > 60 || userInput < 1)
            System.out.println("Invalid input");

          int randomNumber = (int) (Math.random() * 60) + 1;
          if (userInput == randomNumber)
            System.out.println("Congrats, you have won!");
        else
          System.out.println("Sorry, you didn't choose the winning number." + "The winning number is " + randomNumber + ".");
          userEntries+=userInput+ ((counter < 5) ? "-" : "");
          randomEntries+=randomNumber+((counter < 5) ? "-" : "");
        }
        System.out.println(userEntries);
        System.out.println(randomEntries);
     }
}

OUTPUT:

Enter a number between 1-60: 
Sorry, you didn't choose the winning number.The winning number is 28.
Enter a number between 1-60: 
Sorry, you didn't choose the winning number.The winning number is 39.
Enter a number between 1-60: 
Sorry, you didn't choose the winning number.The winning number is 13.
Enter a number between 1-60: 
Sorry, you didn't choose the winning number.The winning number is 13.
Enter a number between 1-60: 
Sorry, you didn't choose the winning number.The winning number is 8.
Enter a number between 1-60: 
Sorry, you didn't choose the winning number.The winning number is 42.
1-2-3-4-56
28-39-13-13-842