1. Prof. Alfred J Bird, Ph.D., NBCT abird@cs.umb.edu http://it441-f12.wikispaces.umb.edu/ Office – Wheatly 2nd floor 096-03 Office Hours – MW 3:00PM to 4:00PM

2.  Write a program that: Asks you the numeric value of the month and the year you were born, creates an array called @months with the names of the months and an array called @numDays that contains the number of days in a month (remember leap years) and use these arrays in a print statement to print out the month, the year and how many days are in the month you were born based on the info you entered.

3.  Write a program that: Asks you the numeric value of the month and the year you were born, creates an array called @months with the names of the months and an array called @numDays that contains the number of days in a month (remember leap years) and use these arrays in a print statement to print out the month, the year and how many days are in the month you were born based on the info you entered. #!/usr/bin/perl/ print “Enter the number of the month you were born: “; chomp ($month = ); print “Enter year you were born: “; chomp ($year = ); @months = qw&January February March April May June July August September October November December&; @numDays = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); $numDaysCorrect = $numDays[$month-1]; if ($month==2 && $year%4==0){$numDaysCorrect=29;} print (“$months[$month-1] $year has $numDaysCorrect days \n”);

4.  Write code using the previous program that will print out a series of statements like the following:  The month of January has 31 days  …  Assume you do not know how many entries there are in the arrays but that both arrays have the same numbers of entries

5.  How do we add data to an array?  @array = (@array, $scalar); #is one way!  But there is a better way!!  push @array, $scalar; #will do the same thing!  push will append the value in $scalar to the top of @array  Likewise pop will take the last value in an array and do something with it.  $scalar = pop @array

6.  push() and pop() act on the top of an array (the highest indexed end)  shift() and unshift() act on the bottom of an array and perform the same function.  We already know what reverse() does.

7.  Another function is sort().  What do you think it does?  Write a simple program to try it with your array of months.  Predict the output before you try it.  What happened?  Now write a simple program to try it with an array of number between 0 and 100 (at least 20 numbers).  Predict the output before you try it.  What happened?????  Why?????

8.  Read pages 95 to 114 in the textbook.