Section 2.1. What Is Scalar Data?
Section 2.2. Numbers
Section 2.3. Strings
Section 2.4. Perl's Built-in Warnings
Section 2.5. Scalar Variables
Section 2.6. Output with print
Section 2.7. The if Control Structure
Section 2.8. Getting User Input
Section 2.9. The chomp Operator
Section 2.10. The while Control Structure
Section 2.11. The undef Value
Section 2.12. The defined Function
Section 2.13. Exercises