refact-1.java

class Account {
	float principal;
	float rate;
	int daysActive;
	int accountType;

	public static final int STANDARD = 0;
	public static final int BUDGET = 1;
	public static final int PREMIUM = 2;
	public static final int PREMIUM_PLUS = 3;

	float calculateFee(Account accounts[]) {
		float totalFee = 0;
		Account account;
		for (int i = 0; i < accounts.length; i++) {
			account = accounts[i];
			if (account.accountType == Account.PREMIUM || 
                            account.accountType == Account.PREMIUM_PLUS) {
				totalFee += 0.0125 * (account.principal * Math.exp( account.rate * 
                            (account.daysActive / 365.25) ) - account.principal);
			}
		}
	    return totalFee;
	}
}