Example: ATM Cash Withdrawal Simulation in C++

// ATM Cash Withdrawal Simulation
#include <iostream> // Required for input/output operations
#include <iomanip>  // Required for setting precision for currency display
using namespace std;

int main() {
    // Step 1: Initialize account balance
    double accountBalance = 1000.00; // Starting balance of the account
    double withdrawalAmount;         // Variable to store the user's requested amount

    // Step 2: Display welcome message and current balance
    cout << "Welcome to the ATM!" << endl;
    cout << fixed << setprecision(2); // Format output to two decimal places for currency
    cout << "Your current balance is: $" << accountBalance << endl;

    // Step 3: Prompt user for withdrawal amount
    cout << "Enter amount to withdraw: $";
    cin >> withdrawalAmount;

    // Step 4: Validate the withdrawal amount and process transaction
    if (withdrawalAmount <= 0) {
        cout << "Invalid amount. Please enter a positive number." << endl;
    } else if (withdrawalAmount > accountBalance) {
        cout << "Insufficient funds. Your current balance is $" << accountBalance << "." << endl;
    } else {
        // Step 4a: Process successful withdrawal
        accountBalance -= withdrawalAmount; // Deduct the amount from the balance
        cout << "Transaction successful! Please take your cash." << endl;
        cout << "Your new balance is: $" << accountBalance << endl;
    }

    return 0; // Indicate successful program execution
}