CGS3990, Fall 1998, Perl Assignment 1

Due Thursday 9/3 at the start of class

Read chapter 2 of the Perl book. Write a PERL script that will do the following

• Prompt the user and read in two scalar values.
• Display the values as they were entered, but within double quotes so that any leading or trailing white space will be identifiable.
• Use chomp on each scalar and display them again, as above.
• Display each scalar as a number, and display the sum of the two numbers.
• Treat the scalars as strings and print their concatenation. (Use the . operator).
• Treat the first scalar as a string and the second as a number and print the first repeated the second number of times. (Use the x operator).

Here is a sample of the output

Please enter something: 12we3
Please enter something else: 3er4

Here is the input
	something: "12we3

"
	something else: "3er4

"

Here is input after chomp
	something: "12we3"
	something else: "3er4"

Here is the input treated as numbers
	something: "12"
	something else: "3"
	12 + 3 = 15


Here is the input treated as strings, and concatenated
        "12we3" . "3er4" = 12we33er4

Here is the first repeated the second number of times
	"12we3" x "3" = "12we312we312we3"

Where is Perl????

On solix the command for Perl will be
#!/home/sol2/bin/perl

On mongoose the command for Perl will be
#!/usr/local/bin/perl

Creating and Running the program

• Use either the pico editor or the emacs editor to type in your program
• Exit back to the shell, and change the mode of your file to 700
  chmod 700 hw1.pl
• Now, to run the program, just type its name at the prompt
• If there are errors, then reopen the editor and make the corrections, then try to run it again. However, you only have to do the chmod command once.

Handing it in

• Be sure that your name, section, and oath attesting that you did the work on your own are included at the start of your file as comments.
• To create a listing, use the script command from solix.
  • Enter the command
    script
  • Use the cat command to display the file
    cat hw1.pl
  • Run the program several times with different input
  • Type exit to end the script session
• Print out the typescript file using lpr. Hand in the printout.