#include <iostream.h>

double new_balance(double balance_par, double rate_par);
//Returns the balance in a bank account after 
//posting simple interest. The formal parameter balance_par is 
//the old balance. The formal parameter rate_par is the interest rate.
//For example, if rate_par is 5.0, then the interest rate is 5%
//and so new_balance(100, 5.0) returns 105.00.

main()
{
    double balance = 100;

    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2);

    cout << "balance = $" << balance << endl;
    cout << "new balance = $" << new_balance(balance, 5.5) << endl;
    cout << "Now edit the program comment so the other definition is used.\n";

    return 0;
}

double new_balance(double balance_par, double rate_par)
{
    double interest_fraction, interest;

    interest_fraction = rate_par/100;
    interest = interest_fraction*balance_par;
    return (balance_par + interest);
}

/*
double new_balance(double balance_par, double rate_par)
{
    double interest_fraction, updated_balance;

    interest_fraction = rate_par/100;
    updated_balance = balance_par*(1 + interest_fraction);
    return updated_balance;
}
*/