48 lines
1.4 KiB
NASM
48 lines
1.4 KiB
NASM
bits 32 ; assembling for the 32 bits architecture
|
|
|
|
; declare the EntryPoint (a label defining the very first instruction of the program)
|
|
global start
|
|
|
|
; declare external functions needed by our program
|
|
extern exit,scanf,printf ; tell nasm that exit exists even if we won't be defining it
|
|
import exit msvcrt.dll ; exit is a function that ends the calling process. It is defined in msvcrt.dll
|
|
import scanf msvcrt.dll
|
|
import printf msvcrt.dll
|
|
|
|
; our data is declared here (the variables needed by our program)
|
|
|
|
;Read two numbers a and b (in base 10) from the keyboard. Calculate and print their arithmetic average in base 16
|
|
|
|
segment data use32 class=data
|
|
read_query db "%d",0
|
|
write_query db "The arithmetic average in base 16 is: 0x%08X",0
|
|
a dd 0
|
|
b dd 0
|
|
|
|
; our code starts here
|
|
segment code use32 class=code
|
|
start:
|
|
; ...
|
|
push dword a
|
|
push dword read_query
|
|
call [scanf]
|
|
add ESP,4*2
|
|
|
|
push dword b
|
|
push dword read_query
|
|
call [scanf]
|
|
add ESP,4*2
|
|
|
|
mov EAX,[a]
|
|
add EAX,[b]
|
|
sar EAX,1
|
|
|
|
push EAX
|
|
push write_query
|
|
call [printf]
|
|
add ESP, 4*2
|
|
|
|
; exit(0)
|
|
push dword 0 ; push the parameter for exit onto the stack
|
|
call [exit] ; call exit to terminate the program
|