# Cash

Implement a program that calculates the minimum number of coins required to give a user change.

$python cash.py Change owed: 0.41 4  ## Accepting this Assignment 1. Accept this assignment via GitHub Classroom. 2. After about a minute, refresh the page and ensure you see â€śYouâ€™re ready to go!â€ť. ## Getting Started Log into code.cs50.io, click on your terminal window, and execute cd by itself. You should find that your terminal windowâ€™s prompt resembles the below: $


Next execute

get50 sentimental-cash


in order to download a directory called sentimental-cash into your codespace.

Then execute

cd sentimental-cash


in order to change into that directory. Your prompt should now resemble the below:

sentimental-cash/ $ Execute ls by itself, and you should see a few files and folders: cash.py  If you run into any trouble, follow these same steps again and see if you can determine where you went wrong! ## Specification • Write, in a file called cash.py, a program that first asks the user how much change is owed and then spits out the minimum number of coins with which said change can be made. You can do this exactly as you did in Problem Set 1, except that your program this time should be written in Python, and you should assume that the user will input their change in dollars (e.g., 0.50 dollars instead of 50 cents). • Use get_float from the CS50 Library to get the userâ€™s input and print to output your answer. Assume that the only coins available are quarters (25Â˘), dimes (10Â˘), nickels (5Â˘), and pennies (1Â˘). • We ask that you use get_float so that you can handle dollars and cents, albeit sans dollar sign. In other words, if some customer is owed$9.75 (as in the case where a newspaper costs 25Â˘ but the customer pays with a $10 bill), assume that your programâ€™s input will be 9.75 and not $9.75 or 975. However, if some customer is owed $9 exactly, assume that your programâ€™s input will be 9.00 or just 9 but, again, not $9 or 900. Of course, by nature of floating-point values, your program will likely work with inputs like 9.0 and 9.000 as well; you need not worry about checking whether the userâ€™s input is â€śformattedâ€ť like money should be.
• If the user fails to provide a non-negative value, your program should re-prompt the user for a valid amount again and again until the user complies.
• Incidentally, so that we can automate some tests of your code, we ask that your programâ€™s last line of output be only the minimum number of coins possible: an integer followed by a newline.

## Usage

Your program should behave per the example below.

\$ python cash.py
Change owed: 0.41
4


## Testing

While check50 is available for this problem, youâ€™re encouraged to first test your code on your own for each of the following.

• Run your program as python cash.py, and wait for a prompt for input. Type in 0.41 and press enter. Your program should output 4.
• Run your program as python cash.py, and wait for a prompt for input. Type in 0.01 and press enter. Your program should output 1.
• Run your program as python cash.py, and wait for a prompt for input. Type in 0.15 and press enter. Your program should output 2.
• Run your program as python cash.py, and wait for a prompt for input. Type in 1.60 and press enter. Your program should output 7.
• Run your program as python cash.py, and wait for a prompt for input. Type in 23 and press enter. Your program should output 92.
• Run your program as python cash.py, and wait for a prompt for input. Type in 4.2 and press enter. Your program should output 18.
• Run your program as python cash.py, and wait for a prompt for input. Type in -1 and press enter. Your program should reject this input as invalid, as by re-prompting the user to type in another number.
• Run your program as python cash.py, and wait for a prompt for input. Type in foo and press enter. Your program should reject this input as invalid, as by re-prompting the user to type in another number.
• Run your program as python cash.py, and wait for a prompt for input. Do not type anything, and press enter. Your program should reject this input as invalid, as by re-prompting the user to type in another number.

Execute the below to evaluate the correctness of your code using check50. But be sure to compile and test it yourself as well!

check50 cs50/problems/2021/fall/sentimental/cash


Execute the below to evaluate the style of your code using style50.

style50 cash.py


This problem will be graded only along the axes of correctness and style.

## How to Submit

In your terminal window, execute the below.

submit50 sentimental-cash


You may submit as many times as you would like up until the deadline. To confirm your submission, go to https://github.com/classroom50/sentimental-cash-USERNAME, where USERNAME is your GitHub username. You should see the code from your latest submission.