How to print a DWord in assembly?

Question

I'm learning Assembly, and it would be nice for me to be able to output a number to the screen instead of just a string of text. I know how to print a character using mov eax, 1 , but that doesn't work with DWords.

I am using 64-bit Ubuntu.

Makefile:

all:
    nasm -f elf64 asm.s -o asm.o
    ld asm.o -o asm
    rm asm.o

Answer 1

One easy way to print stuff would be just using printf , you're asking how to print a dword, that's easy:

extern _printf

SECTION .data
    msg:     db "Printing a dword: %d",10,0
    number:  dd  123456789

SECTION .text
    global start

start:
    push dword [number]
    push dword msg
    call _printf
    add esp, 8
    mov eax, 0
    ret