Breaking Down Programs with Procedures

Procedures (or functions) let you organize your code into reusable chunks. In NASM, you can define procedures, pass parameters (often via registers or the stack), and return results.

How to Define a Procedure

A procedure has a label, code, and a ret instruction to return:

my_proc:
    ; do something cool
    ret

Calling Procedures

Use call to jump to your procedure and ret to come back. Parameters are usually passed in registers or pushed onto the stack.

Why Modular Programming Matters

• Readability: Easier to understand and debug
• Reusability: Write once, use many times
• Teamwork: Work on different parts at the same time

Modular design is a pro skill that makes even the biggest NASM programs manageable!