/* Craig Persiko  -  CS 111A
   DaysOut.java - Solution to Days Out in-class exercise
   Days Out program

   This program calculates average days out of work by a number of employees
*/

import java.util.Scanner;


public class DaysOut
{
  static Scanner keyIn = new Scanner(System.in);

  public static void main(String args[])
  {
    int   employees,            // To hold the number of company employees.
          daysAbsent;           // To hold the total days absent of all employees.

    employees = getNumEmps();
    daysAbsent = getDaysMissed(employees);
    showAvgDaysMissed(employees, daysAbsent);
  } // End of main function.

  //*******************************************************************
  // Function getNumEmps. This function asks the user to enter        *
  // the number of employees in the company. Validation is performed  *
  // to verify at least one employee, the value entered is            *
  // then returned to function main.                                  *
  //*******************************************************************
  static int getNumEmps()
  {
    int emps;

    // Get the number of employees.
    System.out.print("How many employees does the company have? ");
    emps = keyIn.nextInt();

    // Validate the input.
    while (emps < 1)
    {
      System.out.print("The number of employees must be one or greater. ");
      System.out.print("Please re-enter: ");
      emps = keyIn.nextInt();
    }
    return emps;

  } // End of function getNumEmps

  //*******************************************************************
  // Function daysMissed. Accepts as an argument the number of        *
  // employees in the company. User is asked to enter the             *
  // number of days missed by each employee. Validation performed to  *
  // confirm negative number is not entered. The total days missed    *
  // by all employees is returned.                                    *
  //*******************************************************************
  static int getDaysMissed(int numEmps)
  {
    int days,       // To hold the days missed by a given employee
        totalMissed = 0;  // Accumulates total days missed

    for (int emp = 1; emp <= numEmps; emp++)
    {
      // Get number of days missed...
      System.out.print("Days missed by employee #" + emp + " : ");
      days = keyIn.nextInt();
      // Validate the input...
      while (days < 0)
      {
        System.out.print("Days missed must be zero or greater. Please re-enter: ");
        days = keyIn.nextInt();
      }
      totalMissed += days;  // Accumulate the number of days missed.
    }

    return totalMissed;

  } // End of function getDaysMissed

  //*******************************************************************
  // Function showAveDaysMissed. This function accepts the number of  *
  // employees and the total number of days missed by all employees   *
  // as arguments. The average number of days missed is calculated    *
  // and output.                                                      *
  //*******************************************************************
  static void showAvgDaysMissed(int emps, int days)
  {
    float daysPerEmp = (float)days / emps;
    
    System.out.print("The average number of days missed per ");
    System.out.printf("employee is %.1f \n", daysPerEmp);
    
  } // End of function avgDaysMissed
}

/* Sample Output:

bash-2.04$ java PP5
How many employees does the company have? -3
The number of employees must be one or greater. Please re-enter: 0
The number of employees must be one or greater. Please re-enter: 3
Days missed by employee # 1 :6
Days missed by employee # 2 :10
Days missed by employee # 3 :1

The average number of days missed per employee is 5.7

bash-2.04$ java PP5
How many employees does the company have? 5
Days missed by employee # 1 :-5
Days missed must be zero or greater. Please re-enter: 0
Days missed by employee # 2 :-1
Days missed must be zero or greater. Please re-enter: -10
Days missed must be zero or greater. Please re-enter: 10
Days missed by employee # 3 :20
Days missed by employee # 4 :0
Days missed by employee # 5 :5

The average number of days missed per employee is 7.0

*/