In: Computer Science

Change Calculator

**Task**:

Create a program that will input a price and a money amount. The program will then decide if there is any change due and calculate how much change and which coins to hand out. Coins will be preferred in the least number of coins (starting with quarters and working your way down to pennies).

**Input**:

total_price, amount_tender

allow the user to input 'q' for either value if they want to quit
the program

**Validate**:

total_price

- cannot be negative
- cannot be 0
- cannot be text (other than q for quit)

amount_tender

- cannot be less than total_price
- can be equal to total_price
- cannot be text (other than q for quit)

**Output**:

change_amount

number_quarters

number_dimes

number_nickels

number_pennies

IF any of these values is zero, DO NOT output that value. IE: if the change is 26 cents you only need to tell the user they will receive 1 quarter and 1 penny. No more, no less.

**Hint**:

Use modular division to track the remainder after calculating each number of coins.

Convert the decimal to a whole number to make the calculation easier. Use math.floor() to round DOWN to the nearest integer.

Use a try-catch (try-except) to help validate input. Try to set the input value into afloat and if it does not fit then you can test the input further without an error stopping your program.

**Requirements**:

Use a function

Use a loop

Validate all input

Use an IF statement

Use helpful, human-readable text both to prompt for input, but also to let the user know about invalid inputs. Simply stating it is invalid doesn't help the user to correct their error.

If you can make your program also calculate the number of dollars for change. That is, change above 99 cents.

**Turn IN**:

Python file ONLY

In case of any queries,please comment. I would be very happy to assist all your queries.Please give a Thumps up if you like the answer.

**Program**

import sys

def calcCoins(moneyback):

quarter = 0.25

dime = 0.10

nickel = 0.05

penny = 0.01

moneybacknew=moneyback-int(moneyback)

quarter_money_back = int(moneybacknew / quarter)

partialtotal = moneybacknew - quarter_money_back * quarter

dimes_money_back = int(partialtotal / dime)

dpartialtotal = partialtotal - dimes_money_back * dime

nickel_money_back = int(dpartialtotal / nickel)

npartialtotal = dpartialtotal - nickel_money_back * nickel

penny_money_back = int(npartialtotal / penny)

penny_partial_total = npartialtotal - penny_money_back * penny

return
quarter_money_back,dimes_money_back,nickel_money_back,penny_money_back

def calcDollar(moneyback):

hundred_dollar_bill = 100

fifty_dollar_bill = 50

twenty_dollar_bill = 20

ten_dollar_bill = 10

five_dollar_bill = 5

two_dollar_bill = 100

one_dollar_bill = 1

fiftydmb = int(moneyback / fifty_dollar_bill)

fiftydnewbalance=moneyback-fiftydmb*fifty_dollar_bill

twentydmb=int(fiftydnewbalance / twenty_dollar_bill)

twentydnewbalance=fiftydnewbalance-twentydmb*twenty_dollar_bill

tendmb=int(twentydnewbalance / ten_dollar_bill)

tendnewbalance=twentydnewbalance-tendmb*ten_dollar_bill

fivedmb=int(tendnewbalance / five_dollar_bill)

fivednewbalance=tendnewbalance-fivedmb*five_dollar_bill

twodmb= int(fivednewbalance / two_dollar_bill)

twodnewbalance=fivednewbalance-twodmb*two_dollar_bill

onedmb=int(twodnewbalance / one_dollar_bill)

onednewbalance=twodnewbalance-onedmb*one_dollar_bill

return fiftydmb,twentydmb,tendmb,fivedmb,twodmb,onedmb

def main():

while True:

try:

total_price = input("Enter the price of item: $ ")

if (str(total_price)=='q'):#user want to quit the program

print("Quit!!!")

sys.exit(0)

total_price=float(total_price)

if (total_price<=0):#total_price cannot be negative and cannot
be 0

print("Sorry, Total price must not be negative or zero.")

continue

except ValueError:

print("Sorry, Enter valid amount")

continue

else:

break

while True:

try:

amount_tender = input("Enter how much money given: $")

if (str(amount_tender)=='q'):#user want to quit the program

print("Quit!!!")

sys.exit(0)

amount_tender=float(amount_tender)

if (amount_tender<=total_price):#amount_tender cannot be less
than total_price or can be equal to total_price

print("Sorry,Amount Tender cannot be less than or equal to Total
Price")

continue

except ValueError:

print("Sorry, Enter valid amount")

continue

else:

break

change_amount = amount_tender - total_price

fiftydmb,twentydmb,tendmb,fivedmb,twodmb,onedmb=calcDollar(change_amount)

number_quarters,number_dimes,number_nickels,number_pennies=calcCoins(change_amount)

print("Change Due : $",change_amount)

print("Balance to be given : ")

if fiftydmb>0:

print (fiftydmb,"$ 50 Bill")

if twentydmb>0:

print (twentydmb,"$ 20 Bill")

if tendmb>0:

print (tendmb,"$ 10 Bill")

if fivedmb>0:

print (fivedmb,"$ 5 Bill")

if twodmb>0:

print (twodmb,"$ 2 Bill")

if onedmb>0:

print (onedmb,"$ 1 Bill")

if number_quarters>0:

print(number_quarters, 'quarters' )

if number_dimes>0:

print(number_dimes,'dime')

if number_nickels>0:

print(number_nickels,'nickels')

if number_pennies>0:

print(number_pennies, 'pennys')

main()

**Output**

Enter the price of item: $ q

Quit!!!

>>>

Enter the price of item: $ 0

Sorry, Total price must not be negative or zero.

Enter the price of item: $ -9

Sorry, Total price must not be negative or zero.

Enter the price of item: $ w

Sorry, Enter valid amount

Enter the price of item: $ q

Quit!!!

>>>

Enter the price of item: $ 9

Enter how much money given: $q

Quit!!!

>>>

Enter the price of item: $ 9

Enter how much money given: $9

Sorry,Amount Tender cannot be less than or equal to Total
Price

Enter how much money given: $4

Sorry,Amount Tender cannot be less than or equal to Total
Price

Enter how much money given: $100

Change Due : $ 91.0

Balance to be given :

1 $ 50 Bill

2 $ 20 Bill

1 $ 1 Bill

Enter the price of item: $ 0

Sorry, Total price must not be negative or zero.

Enter the price of item: $ -9

Sorry, Total price must not be negative or zero.

Enter the price of item: $ 9.74

Enter how much money given: $8

Sorry,Amount Tender cannot be less than or equal to Total
Price

Enter how much money given: $0

Sorry,Amount Tender cannot be less than or equal to Total
Price

Enter how much money given: $100

Change Due : $ 90.26

Balance to be given :

1 $ 50 Bill

2 $ 20 Bill

1 quarters

1 pennys

**Program
Screenshot**

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