Perl Programming/Exercise 2

A. Input from the keyboard Write a program which asks for a line of text to be entered on the keyboard, and then displays that text on screen. Modify the program to ask for 3 lines of text, and display them on one line with a | symbol between each input. Input from the command-line Write a program which you can call like so: perl myscript.pl "Argument 1" "Argument 2" "Argument 3" The program should take as many command-line arguments as are available, and display them on screen. Input from a text file Create a text file containing the following 3 lines: This is line one This is line two This is line threes Write a program which reads the file, and displays all the lines of text. Modify it so that the whole file is output on one line with | characters between each input. use strict; use warnings; open MYFILE, '3lines.txt'; foreach(<MYFILE>){ chomp; print $_," |"; } output: This is line one | This is line two | This is line threes |Press any key to continue . . . Putting it all together Using the program from exercise 1, write a program which takes three numbers as command-line arguments, and solves the quadratic equation where those numbers are the coefficients (a, b, c). Print the roots. If no numbers are available from the command-line, prompt the user to type each number at the keyboard. If the first command-line argument is -h or --help, display some instructions on how to use the program. Answers Previous exercise | Next exercise