Perl for C Programmers

Exercises

1. Write a subroutine that swaps two arrays.

2. Write a subroutine that verifies that the argument is a correctly formed integer. For extra credit, give it a flag that lets it check for integers; floating-point numbers (with and without exponents); complex, hexadecimal, and octal numbers; or any combination of these.

3. Write a module to count the words, lines, and characters in a string.

4. Write a module to print a hash nicely. Handle the case when the values contain new lines. (For extra credit, handle the case when the value contains unprintable characters.)

5. Write a function to encode a string so that it may be enclosed in double quotes safely. For example:

   This "string" contains a backslash (\)

   becomes

    "This \"string\" contains a backslash (\\)" ...