BIF 101 Lab # 3 – Practice with Strings 9/18/08 DUE: before lab 9/25/08
For this lab you will use the information from chapter 3 to write your own programs to
manipulate strings. Make sure that each program is well structured (see handout) and
contains helpful comments.
You should email these programs as attachments to burhansd@canisius.edu
In the body of your email provide a few comments about the difficulty (or lack thereof)
of this assignment.
Write the following Perl programs:
1. yell.pl
Create a string variable with the value
“you know you should get up earlier you will be late”
Use the tr operator to change “you” to “YOU” and print the result
2. concats.pl
Create at least 4 string variables, use the concatenation operator to join them and store
this value in a fifth string variable. Print the original variables out, one per line, followed
by the new variable containing the concatenated value.
3. imp.pl
Create a string variable that contains an imperative sentence with a proper name, for
example, “Debbie, clean your room!”. Print this variable out. Use the substitute operator
to substitute a different proper name and print this new value out (on the next line).
4. funcs.pl
Create a string variable and assign it a value that contains at least 10 characters.
Demonstrate the use of length, index, rindex, uc, lc, reverse, and substr using this variable
and print your results.
5. ATrich.pl
Type the code from page 46 into a program and run it.
6. CpG.pl
Copy your ATrich.pl program, call this copy CpG.pl
Now change the program so that it upper-cases C and G rather than A and T, have the
message it prints be “CG-rich” (rather than “AT-rich).
