Question

Write a program that uses a custom function to generate a specified number of random integers in a specified range. This custom function should take three arguments; the number of integers to generate, the lower limit for the range, and the upper limit for the range. Values for these arguments should be entered by the user in main. The custom function should display the random integers on one line separated by single spaces. The function should also report how many numbers were even and how many were odd. Finally, the function should calculate the total of the random integers and return this total back to main where it will be printed. User inputs in main are shown in blue.
Sample Output
How many integers are to be generated 8
Enter the lowest integer desired 10
Enter the highest integer desired 20
16 14 19 20 12 15 18 18
6 evens and 2 odds were generated
The total of those 8 random numbers is 132

Answer 1

import java.util.*;
import java.lang.*;
public class Main
{
   public static void main(String[] args) {
       int result = customFunction(8,10,20);

       //result variable will give the total sum

//
      
       System.out.println("The total of those 8 random numbers is "+result);

//above print statement can be changeable based on user requirement
   }
  
   public static int customFunction(int no,int lower,int upper)
   {
   Random rand = new Random();
   int num ,randnum ,even=0,odd=0,total=0;
   //rand is a random object to create random numbers
   for (int i=0 ; i<no ; i++ ){
   //i is a loop iteration variable
   num = rand.nextInt();
   //num will generate random number
   randnum = lower + (int)(Math.random() * ((upper - lower) + 1));

//we have other ways to generate random number in given range.
   // the above step will give the number in between the given range
  
   //if the given number is even it is counted on even variable and same as odd
   if (randnum%2==0)
   even++;
   else
   odd++;
   //in total variable we sum up all the numbers
   total+=randnum;
   //printing the numbers
   System.out.print(randnum+" ");
   }
   System.out.println();
   System.out.println(even+" evens and "+odd+" odds were generated");
   return total;
   }
}