/**
 * Matt Kretchmar
 * February 1, 2006
 * MonthDays.java
 * Computes number of days in a month and illustrates how to use nested
 * if statments and switch statements.  
 */
import java.util.Scanner;

class MonthDays
{
  public static void main ( String [] args )
  {
    int month;
    int days=0;
    Scanner keyboard = new Scanner(System.in);
  
    System.out.println("Enter month # (1-12): ");
    month = keyboard.nextInt();
    
    // assign days with nested if statements
    if ( month == 1 || month == 3 || month == 5 || month == 7 || 
        month == 8 || month == 10 || month == 12 )
      days = 31;
    else if ( month == 2 )
      days = 28;
    else if ( month == 4 || month == 6 || month == 9 || month == 11 )
      days = 30;
    else
      System.out.println("invalid entry");
    
    // assign days of month with a switch statement
    switch(month)
    {
      case 1 : case 3 : case 5 : case 7 :
      case 8 : case 10 : case 12 :
               days = 31;
               break;
      case 2 : days = 28;
               break;
      case 4 : case 6 : case 9 : case 11 :
               days = 30;
               break;
      default : 
               System.out.println("invalid entry");
    }

    // print days only if month is valid entry
    if ( month >= 1 && month <= 12 )
        System.out.println("month #" + month + " has days = " + days);
  }
}