This project is a simple Purchase and Customer Management System implemented in C++. It allows users to manage customers and their purchases, providing functionalities to add, update, delete, and display customer and purchase information. The system also allows saving and loading data from files.

• Add, update, and delete customer information
• Add and display purchase information
• Display total spend for a customer
• Save and load customer and purchase data from files
• Print all customers and purchases
• Sort customers by account number

The project uses the following standard C++ libraries:

• <iostream> for input/output operations
• <string> for string manipulations
• <vector> for dynamic array handling
• <fstream> for file input/output operations
• <algorithm> for sorting and other algorithm operations
• <sstream> for string stream manipulations
• <iomanip> for input/output formatting
• <limits> for handling input limits

Represents a single purchase with the following attributes:

• accountNumber: An integer representing the account number
• item: A string representing the item name
• date: A string representing the purchase date
• amount: A double representing the purchase amount

Manages a collection of Purchase objects and provides functionalities to:

• Load purchases from a file
• Print all purchases
• Print purchases by account number
• Print total spend for a customer
• Add new purchases
• Save purchases to a file

Represents a customer with the following attributes:

• firstName: A string representing the first name
• lastName: A string representing the last name
• accountNumber: An integer representing the account number
• streetAddress: A string representing the street address
• city: A string representing the city
• state: A string representing the state
• zipCode: A string representing the ZIP code
• phoneNumber: A string representing the phone number

Manages a collection of Customer objects and provides functionalities to:

• Load customers from a file
• Print all customers
• Print sorted customers
• Print customer account information
• Print total spend for a customer
• Add new customers
• Update and delete customer information
• Save customers to a file

1. Compile the code using a C++ compiler:

   g++ -o customer_management main.cpp