Make Change

/** * Generates a random number as a price of an item, calculates how much change given if paid for using a 20 dollar bill, and calculates how many dollars, quarters, and nickels used. * * @Laura * @1.0 */ import java.lang.Math.*; public class MakeChange { public static void main(String[] args) { double randomNumber = 0; //initializing values double price = 0; double change = 0; double changeCoins = 0; int dollars = 0; int quarters = 0; int dimes = 0; int pennies = 0; randomNumber = Math.random() * 18 + 1; //generates a random number between 1 and 18 price = Math.round(randomNumber * 100.0)/100.0; //rounds the number to 2 decimal places System.out.println("Price: $" + price); //outputs the rounded price change = Math.round((20 - price) * 100.0)/100.0; //rounded again to prevent error from leftover price decimals System.out.println("Change: $" + change); //ouputs the change if you pay with a 20 dollar bill changeCoins = change * 100; //converts the change (which is in dollars and cents) to only coins dollars = (int)(changeCoins/100); //sets dollars to highest number of times the change in cents can be divided by 100 without a decimal changeCoins %= 100; //sets changeCoins to the remainder when divided by 100 (how much is left over after getting change back in dollars) quarters = (int)(changeCoins/25); changeCoins %= 25; dimes = (int)(changeCoins/10); changeCoins %= 10; pennies = (int) changeCoins; System.out.println("Dollars: " + dollars); //outputs change in dollars System.out.println("Quarters: " + quarters); System.out.println("Dimes: " + dimes); System.out.println("Pennies: " + pennies); System.out.println("Program terminated."); } }