Reference Parameters in C++

balance.cpp

// Reference Parameters in C++

#include <iostream>
using namespace std;


/* Withdraws the amount from the given balance, or withdraws
 a penalty if the balance is insufficient
 
 @param balance: the balance from which to make the withdrawal
 @param amount: the amount to withdraw
*/

void withdraw(double &balance, double amount) { // &balance ==> parameter referencing to decrement value
    // void withdraw(double balance, double amount) ==> will fail to decrement
    
    const double PENALTY = 10;
    if (balance >= amount) {
        balance = balance - amount;
    }
    else {
        balance = balance - PENALTY;
    }
}
int main() {
    
    double hari_account = 1000;
    double arun_account = 10000;
    withdraw(hari_account, 100);
    withdraw(arun_account, 50000);
    withdraw(arun_account, 500);
    cout << "Hari's Account: " << hari_account << endl;
    cout << "Arun's Account: " << arun_account << endl;
    return 0;
    
}