Unit 4: Boolean Decisions and Branching

Software decisions begin as requirements written in ordinary language and end as expressions that evaluate to true or false.

That translation is where many bugs begin.

This unit focuses on:

• comparisons and boolean operators;
• if, else if, and else;
• mutually exclusive versus independent rules;
• branch ordering;
• short-circuit && and ||;
• making invalid states visible instead of quietly routing around them.

The goal is not to memorize conditional syntax. It is to make the decision model inspectable.