What's c++ class? Give me c++ class sample code, how to store c++ class in a computer, what's is the file name

A C++ class is a user-defined data type that encapsulates data and functions into a single entity. It provides a blueprint for creating objects that have similar properties and behaviors. The class defines the data members (variables) and member functions (methods) that operate on the data.

Here is an example of a C++ class for a simple bank account:

class BankAccount {
private:
    std::string accountNumber;
    std::string ownerName;
    double balance;
public:
    BankAccount(std::string accNum, std::string name, double bal) {
        accountNumber = accNum;
        ownerName = name;
        balance = bal;
    }
    void deposit(double amount) {
        balance += amount;
    }
    void withdraw(double amount) {
        if (balance >= amount) {
            balance -= amount;
        } else {
            std::cout << "Insufficient balance!\n";
        }
    }
    double getBalance() {
        return balance;
    }
};

To store a C++ class in a computer, you typically save the code in a text file with a .cpp or .h extension. This file can then be compiled into an executable program or a library that can be linked to other programs.

For example, if you save the above code in a file named BankAccount.cpp, you can compile it using a C++ compiler like g++:

g++ -c BankAccount.cpp

This will create an object file named BankAccount.o, which can then be linked with other object files to create an executable program. Alternatively, you can create a library file (.a or .so) that can be linked to other programs at runtime.