| 01.pl Convert miles to kilometers. | 02.pl Compare a number to zero. |
| 03.pl Compare numbers to each other. | 04.pl See if numbers are equal. |
| 05.pl Variation of 04.pl | 06.pl Running a loop. |
| 07.pl Verifying an answer. | 08.pl Squaring a number. |
| 09.pl Dividing numbers. | 10.pl Playing with variables. |
| 11.pl Environment variables. | 12.pl Playing with arrays. |