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Code Challenge 13 - ATM Validation

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Introduction

An ATM is a machine that allows banking customers to easily access their bank accounts. It performs three basic tasks:

• Inquiry - See your account balance
• Deposit - Put money in your account
• Withdraw - Take money out of your account

Performing validation means to verify that the input from the user is in the correct form. For example, when depositing money, a user cannot deposit a dollar amount less than or equal to 0. Also, when withdrawing money, a user cannot withdraw a dollar amount greater than their bank balance.

The ATM Lite program in the Programming Fundamentals courses does not validate data. This would be unaccetable in a production environment.

Skills to Practice

• Repeating statements using loops
• Making decisions with if statements
• Nesting if statements
• Validating user input

Challenge Tasks

1. Create a console project named CodeChallenge13ATMValidation.
2. Create a banking ATM program that has the following features:

• Shows a main menu with the following options:
  • Inquire balance
  • Deposit
  • Withdraw
  • Exit
• The user should be able to inquire their balance, make a deposit, or make a withdrawal.
  • After the user performs a task, ask if they want to perform another transaction. If they say no, exit the program.
• Validate the user’s input:
  • If the user tries to deposit an amount less than $1, inform them that their deposit must be at least $1.
  • If the user tries to withdraw more money than is in their account, inform them that they have an insufficient balance.
  • If the user selects an invalid menu option, ask them to try again.

4. Set up your balance variable ahead of time. Initialize a variable similar to one of the examples below:

Python

balance = 500

C#

double balance = 500;

Sample Output