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Learning Perl, 5th Edition
book

Learning Perl, 5th Edition

by Randal L. Schwartz, Tom Phoenix, brian d foy
June 2008
Beginner content levelBeginner
352 pages
11h 16m
English
O'Reilly Media, Inc.
Content preview from Learning Perl, 5th Edition

Exercises

See Appendix A for answers to the following exercises:

  1. [7] Write a program that will ask the user for a given name and report the corresponding family name. Use the names of people you know, or (if you spend so much time on the computer that you don’t know any actual people) use the following table:

    InputOutput
    fredflintstone
    barneyrubble
    wilmaflintstone
  2. [15] Write a program that reads a series of words (with one word per line[*]) until end-of-input, then prints a summary of how many times each word was seen. (Hint: remember that when an undefined value is used as if it were a number, Perl automatically converts it to 0. It may help to look back at the earlier exercise that kept a running total.) So, if the input words were fred, barney, fred, dino, wilma, fred (all on separate lines), the output should tell us that fred was seen 3 times. For extra credit, sort the summary words in ASCII order in the output.

  3. [15] Write a program to list all of the keys and values in %ENV. Print the results in two columns in ASCIIbetical order. For extra credit, arrange the output to vertically align both columns. The length function can help you figure out how wide to make the first column. Once you get the program running, try setting some new environment variables and ensuring that they show up in your output.

[*] It has to be one word per line because we still haven’t shown you how to extract individual words from a line of input.

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Publisher Resources

ISBN: 9780596520106Supplemental ContentErrata Page