makeChange.java

import java.util.*;

public class makeChange
{
    public static void main(String args[]){
        //class variables
        
        //make random number
        int max = 1800;
        int min = 100;
        int randomNum = (int)(Math.random() * ((max - min) + 1)) + min; //inclusive
        double myNum = randomNum/100.0;
        //make change
        double change = 20 - myNum;
        change = (int)(change*100)/100.0;
        //coin values
        int tenBills = 0;
        int fiveBills = 0;
        int oneBills = 0;
        int quarters = 0;
        int dimes = 0;
        int nickels = 0;
        int pennies = 0;
        
        System.out.println("Random Number: " + myNum);
        
        System.out.println("Change: " + change);
        //test ten bills
        if(change>=10){
            tenBills++;
            change-= 10;
            System.out.println(tenBills + " 10 bills");
        }
        change=(int)((change*100)+0.5)/100.0;
        //test 5 bills
        if(change>=5){
            fiveBills++;
            change-= 5;
            System.out.println(fiveBills + " 5 bills");
        }
        change=(int)((change*100)+0.5)/100.0;
        //test 1 bills
        while(change>=1){
            oneBills++;
            change-= 1;
            if(change<1){
                System.out.println(oneBills + " 1 bills");
            }
        }
        change=(int)((change*100)+0.5)/100.0;
        //count quarters
        while(change>=0.25){
            quarters++;
            change-= 0.25;
            if(change<0.25){
                System.out.println(quarters + " quarters");
            }
        }
        //count dimes
        change=(int)((change*100)+0.5)/100.0;
        while(change>=0.1){
            dimes++;
            change-= 0.1;
            if(change<0.1){
                System.out.println(dimes + " dimes");
            }
        }
        //count nickels
        change=(int)((change*100)+0.5)/100.0;
        while(change>=0.05){
            nickels++;
            change-= 0.05;
            if(change<0.05){
                System.out.println(nickels + " nickels");
            }
        }
        //count pennies
        //System.out.println(change);
        change=(int)((change*100)+0.5)/100.0;
        //System.out.println(change);
        while(change>=0.01){
            pennies++;
            change-= 0.01;
            change=(int)((change*100)+0.5)/100.0;
            if(change<0.01){
                System.out.println(pennies + " pennies");
            }
        }
    }
}