Write a program for a grocery store to calculate the total charge for customers. In the main: Your program should ask customer the number of items that he/she is purchasing and it should check to see it is less than or equal to 20 items , then your program should pass than number to FillPriceArray subroutine and call FillPriceArray subroutine.

Hello Joelwestwood! This is a good question to check your knowledge of subrountines and Arrays. Please find the implementation with the explanation below.

Explanation:

The solution can be implemented in a number of languages including C++, Java and Python to name a few. Though the implementation language is not specified in the question, i'll provide you the implementation code in Python and also in Java. Java implementation is a little complex because we need to define an array size to be able to add items to it, whereas Python allows us more flexibility by allowing dynamic size of Array.

JAVA IMPLEMENTATION

import java.util.Scanner;

import java.util.Arrays;

class TotalCharge {

 private static int[] price_array = new int[1];

 public void FillPriceArray(int price) {

   if (price_array.length == 1) {

     price_array[0] = price;

   } else {

     price_array = new int[price_array.length + 1];

     price_array[price_array.length + 1] = price;

   }

 }

 public int[] get_price_array() {

   return price_array;

 }

 public static void main(String args[]) {

   System.out.println("Please enter the total number of items to purchase: ");

   Scanner scan = new Scanner(System.in);

   int price = scan.nextInt();

   if (price <= 20) {

     System.out.println("Items being purchased are less than 20");

   } else {

     System.out.println("Items being purchased are more than 20");

   }

   TotalCharge itemsTotal = new TotalCharge();

   itemsTotal.FillPriceArray(price);

   System.out.println(Arrays.toString(itemsTotal.get_price_array()));

 }

}

PYTHON IMPLEMENTATION

calculate_total_charge.py

def FillPriceArray(price):

 price_array.append(price)

price_array = []

price = raw_input("Please enter the total number of items to purchase: ")

try:

 price = int(price)

 if price <= 20:

   print("Items being purchased are less than 20")

 else:

   print("Items being purchased are more than 20")

 FillPriceArray(price)

 print(price_array)

except ValueError:

 print("Invalid input! Exiting..")

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