C++ Bean Machine (I use Visual Studio) Balls are dropped from the opening of the

Question

C++ Bean Machine (I use Visual Studio)

Balls are dropped from the opening of the board. Every time a ball hits a nail, it has a 50% chance to fall to the left or to the right. The piles of balls are accumulated in the slots at the bottom of the board.

Write a program that simulates the bean machine. Your program should prompt the user to enter the number of balls and the number of slots (max 50) in the machine. Simulate the falling of each ball by printing its path. For example, the path could be LLRRLLR. Display the final buildup of the balls in the slots in a histogram. Here is a sample run of the program:

---------------------------------------------------------------------------

Enter the number of balls to drop: 5

Enter the number of slots in the bean machine: 8

LRLRLRR

RRLLLRR

LLRLLRR

RRLLLLL

LRLRRLR

         O

         O

   OOO

---------------------------------------------------------------------------

Explanation / Answer

import java.util.Scanner;


public class DouJi
{
  public static void main(String[] args)
  {
   int numberOfBalls;
   int numberOfSlots;
Scanner input = new Scanner(System.in);
   System.out.print("Enter the number of balls to drop: ");
   numberOfBalls = input.nextInt();
   System.out.print("Enter the number of slots in the bean machine: ");
   numberOfSlots = input.nextInt();


   int[] slots = new int[numberOfSlots + 1];
   for(int i = 0; i <= numberOfSlots; i++)
   {
    slots[i] = 0;
   }


   printBeansPath(slots, numberOfBalls, numberOfSlots);
  }


  public static void printBeansPath(int[] slots, int numberOfBalls, int numberOfSlots)
  {
   double randomNumber;
   int R = 0;

   for(int i = 0; i < numberOfBalls; i++)
   {
    R =0;
    for(int j = 0; j < numberOfSlots; j++)
    {
     randomNumber = Math.random();
     if(randomNumber < 0.5)
     {
      System.out.print("L");
     }
     else
     {
      R += 1;
      System.out.print("R");
     }
    }
    slots[R]++;
    System.out.println();
   }
   System.out.println();
   
   printNumberOfSlotBalls(slots, numberOfSlots, numberOfBalls);
  }


public static void printNumberOfSlotBalls(int[] slots, int numberOfSlots, int numberOfBalls)
  {
   for(int j = maxBalls(slots, numberOfSlots+1); j >= 1; j--)
   {
    for(int i = 0; i < numberOfSlots+1; i++)
    {
     if(slots[i] >= j)
     {
      System.out.print("0");
     }
     else
      System.out.print(" ");
    }
    System.out.println();
   }
  }


  public static int maxBalls(int[] slots, int numberOfSlots)
  {
   int index = 0;


   for(int j = 1; j < numberOfSlots; j++)
   {
    if(slots[index] < slots[j])
    {
     index = j;
    }
   }


   return slots[index];
  }
}

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