//------------
// Introduction to Programming Using Java: An Object-Oriented Approach
//	Arnow/Weiss
//------------
// the total loop
// Chapter 9, Section 9.5, Page 333
// MODIFICATIONS:
//    We have placed the loop in a main method and provided a BufferedReader
//    in a variable named br
//    We have changed the signature of readIn so that it receives a BufferedReader

import java.io.*;

public class Demo_total {
	public static void main(String[] a) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		////////////////////////////////////////////////////////////////////
		int totalPay;	// totalPay== the total paid out so far.
		int count;	// count== the number of employees processed so far.
		Employee emp;	// emp refers to the most recently read Employee object.
		int hours;	// hours== the number of hours worked by the
				//      most recently read employee.
		count = 0;
		totalPay = 0;
		emp = Employee.readIn(br);
		// All Employee objects created prior to the one emp refers to have been processed.
		while (emp!=null) {
			System.out.print("Enter hours for ");
			System.out.print(emp.getName());
			System.out.print(": ");
			hours = Integer.parseInt(br.readLine());
			count++;
			int  pay = emp.calcPay(hours);
			System.out.println(pay);
			totalPay += pay;
			emp = Employee.readIn(br);
		}
		System.out.print("Total payout: ");
		System.out.println(totalPay);
		////////////////////////////////////////////////////////////////////
	}
}

// Here is some sample input for this program:
// Wallabee
// 15
// 40
// Fox
// 18
// 40
// Hawkins
// 8
// 25


// The following is minimal version of an Employee class
// suitable for demonstrating the above loop. Normally
// it would be in a separate file, but is included in this
// file for the sake of convenience.

class Employee {
	Employee(String name, int pay) {
		this.name = name;
		this.pay = pay;
	}

	static Employee readIn(BufferedReader br) throws Exception {
		String n = br.readLine();
		if (n==null)
			return null;
		String p = br.readLine();
		if (p==null)
			return null;
		return new Employee(n,Integer.parseInt(p));
	}

	String getName() { return name;}

	int calcPay(int hours) { return hours*pay; }

	private	String	name;
	private	int	pay;
}