Question

Assume the following declarations have been made in main():

int howmany;

Scanner kb = new Scanner(System.in);

Random r = new Random();

Write code to do the following:

• Use a while loop to prompt the user for how many numbers are to be entered. If the user does not enter a positive number (a number greater than 0), display a message saying the number must be positive and to try again. Store this value in the howmany variable.
• Declare an integer array named nums, using the howmany variable for the length of the array.
• Use a do-while loop and the random number generator to give all elements of the array values between 5 and 45.
• Use a for loop to display the elements of the array in a single row, with each element separated by commas. There should not be a comma after the last element. Example: 8, 42, 13, 12, 19

Rules:

• Submit only the code you are asked to write. You do not have to create a main program.
• The code you submit must still follow all Java syntax rules and compile.

• The howmany variable cannot be given an initial value in a single line of code, (howmany = 5; for example). It must be given a value only through user input.
• You must use the exact type of loop in each part that requires a loop.
• The test conditions for the last two loops must not contain any constant numbers.

Answer 1

import java.util.Random;
import java.util.Scanner;

public class RandomGenerator {

   public static void main(String[] args) {
int howmany;
       Scanner kb = new Scanner(System.in);
       Random r = new Random();
       System.out.println("Enter the count of numbers to be entered");
       howmany=kb.nextInt();
       while(true){
           if(howmany<=0){
               System.out.println("Enter a positive number (a number greater than 0)");
               howmany=kb.nextInt();
           }
           else{
               break;
           }
       }
       int nums[]=new int[howmany];
       int i=0;
       do{
           int result = r.nextInt(45-5) + 5;
nums[i]=result;
i++;
}while(i<howmany);
         
       for(int j=0;j<nums.length;j++){
           System.out.print(nums[j]);
           if(j!=nums.length-1){
               System.out.print(",");
           }
          
       }

   }

}

Expected output:

Enter the count of numbers to be entered Enter a positive number (a number greater than o) 5 19,18,10,14,38