Exercises
See Appendix A for answers to the following exercises:
[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:
Input Output fredflintstonebarneyrubblewilmaflintstone[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 werefred,barney,fred,dino,wilma,fred(all on separate lines), the output should tell us thatfredwas seen3times. For extra credit, sort the summary words in ASCII order in the output.[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. Thelengthfunction 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.