NASM Coding: Constants and String Length

3. Using literals in your code. Example:

   mov rax, 10
   mov rbx, 0xA
   mov rcx, 'A'

   Explanation: This is probably the most straightforward way to work with constants, as any number or character literal is considered a constant: just write the literal(s) directly in the code (=

   .text

   section) inside the instructions you call.

Quick summary for NASM x86_64 constants:

1. equ

   defines fixed values, such as a string's length (in bytes/chars).

2. %define

   can be used as a macro: code substitution.
3. Number and character literals like

   oah

   or

   'z'

   can be directly embedded in the code.