Question

write a program in java that determines the change to be dispensed from a vending machine. An item in the machine can cost between 25 cents and a dollar, in a 5-cent increments(25,30,35.....,90,95,or 100), and the machine accepts only a single dollar bill to pay for the item. for example a possible dialogue with the user might be "Enter price of item (from 25 cents to a dollar, in 5-cent increments):45 you boughtan item for 45 cents and gave me a dollar. so your change is 2 quarters, 0 dimes, and 1 nickles." include input checking. Display the change only if the valid price is entered (no less than 25 cents no more than 100 cents, and an integer multiple of 5 cents). otherwise display seperate error messages for any of the following invalid inputs: a cost under 25 cents, a cost that is not an integer multiple of 5, and a cost that is more than a dollar. Be sure to use the proper heading content and layout (heading.txt) Be sure to update the name, date, and documentation information. Calculations should be separate statements, not placed in the print

statement. The user will enter the cost of the item (integer) Validate the cost value and display any needed message according to the project instructions. The program will produce output similar to what is shown on page 132. Additional instruction: When the value of a coin denomination is zero, do not print the information for that coin. Using this at the base.

DOCUMENTATION Page ?, programming project #? This program ******************************************************************************/

import java.util.Scanner;

public class program##

{ public static void main(String[] args) { enter code here } }

Answer 1

The above question can be answered in the following steps-

STEP 1- First we will prompt the user to enter the price of the item under the conditions specified. Then check if the price input lies between 25 and 100 and is a multiple of 5.

STEP 2- if the above condition is specified, declare variables to store the no of quarters,dimes and nickles. Compute the change by deducting the price from 100. Then the change is converted to quarters, then the rest change is converted to dimes and the rest change into nickles.

STEP 3- Then we print the value of all denominations only if the value is NOT zero as mentioned in question.

STEP 4- And if the price does not lies in the VALID range, we check due to which reason did it get invalid and print the appropriate reason as given in question.

JAVA CODE-

//import the necessary package
import java.util.Scanner;
//define the class
public class program
{
//write the main method
   public static void main(String[] args) {
   //create a scanner Object
   Scanner scn = new Scanner(System.in);
   //prompt the user to enter the price of item
       System.out.print("Enter price of item (from 25 cents to a dollar, in 5-cent increments) : ");
       int price = scn.nextInt(); //store the price
       //if price is valid,i.e,lies between 25 to 100 and its divisble by 5, then its valid
       if(price >=25 && price<=100 && (price%5) ==0){
       //variable to store the number of Quarters, dimes and Nickles
       int noOfQuarters = 0, noOfDimes = 0, noOfNickles = 0;
       //compute the change price by reducing it from 100(a dollar)
       int change = 100 - price;
       //convert it to Quarters
       if(change >= 25){
       noOfQuarters = change/25;
       change = change - (noOfQuarters*25);
       }
       //convert the rest to Dimes
       if(change >= 10){
       noOfDimes = change/10;
       change = change - (noOfDimes*10);
       }
       //conver the rest to Nickles
       if(change >= 5){
       noOfNickles = change/5;
       }
       //print the change in terms of Quarters,dimes and Nickles
       //print only if value of a coin denomination is NOT zero
       System.out.print("Your change is = ");
       if(noOfQuarters != 0){
       System.out.print(noOfQuarters + " Quarters ");
       }
       if(noOfDimes != 0){
       System.out.print(noOfDimes + " Dimes ");
       }
       if(noOfNickles != 0){
       System.out.print(noOfNickles + " Nickles");
       }
       }
       //and otherwise, when the input price is INVALID
       else{
       //check what is the reason and print correct message
       if(price <25){
       System.out.println("A cost under 25 cents");
       }
       else if(price > 100){
       System.out.println("A cost that is more than a dollar");
       }
       else if((price%5) != 0){
       System.out.println("A cost that is not an integer multiple of 5");
       }
       }
   }
}

IMAGE OF CODE-

OUTPUT-

Case #1

Case#2

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