How to represent octal numbers in Assembly?

Question

For example for hexadecimal numbers we can use 0x98398 or 8790h.

How can octal numeric constants be written? Does this work?

Answer 1

Depends on the assembler, but most of the assemblers including NASM allow 0o, o standing for octal. Just like you use 0x where x stands for Hexadecimal.

    mov     ax,310q         ; octal 
    mov     ax,310o         ; octal again 
    mov     ax,0o310        ; octal yet again 
    mov     ax,0q310        ; octal yet again 

Source of information: Here .

Again it's not 0o or the syntax above for all assemblers. It might vary by assemblers , but NASM does indeed use the above-mentioned syntax as you can see the link provided for more information. If you have other assemblers in mind, check out their manuel like for FASM: Here . GAS: Here