Numbers.asm

.386
.model flat, stdcall
option casemap :none

include C:\masm32\include\windows.inc
include C:\masm32\include\masm32.inc
include C:\masm32\include\kernel32.inc
includelib \masm32\lib\masm32.lib
includelib \masm32\lib\kernel32.lib


.data
        Number1 dword 0
        Number2 dword 0        
        UserInput1 db 10 DUP(0)
        UserInput2 db 10 DUP(0)
        Message1 db "Enter First Number: ",0
        Message2 db "Enter Second Number: ",0
        SumString db 10 DUP(0)
        SubString db 10 DUP(0)        
        Message3 db "The sum of the Numbers is: ",0
        Message4 db "The difference of the Numbers is: ",0
        NumSum dword 0
        NumSub dword 0
        
        
.code
start:

    ; user Input.
    
    invoke StdOut, addr Message1
    invoke StdIn, addr UserInput1, 10
    invoke StdOut, addr UserInput1
    invoke StdOut, addr Message2
    invoke StdIn, addr UserInput2, 10
    invoke StdOut, addr UserInput2

    ; Remover CRLF
    invoke StripLF, addr UserInput1
    invoke StripLF, addr UserInput2

    ; Convertir Strings a numeros.    
    invoke atodw, addr UserInput1
    mov Number1, eax

    invoke atodw, addr UserInput2
    mov Number2, eax

    ; Suma
    mov eax, Number1
    add eax, Number2
    mov NumSum, eax

    ;Resta
    mov eax, Number1
    sub eax, Number2
    mov NumSub, eax

    ;Convertir numeros a strings
    invoke dwtoa, NumSum, addr SumString
    invoke dwtoa, NumSub, addr SubString    

    ;Pintar por pantalla
    invoke StdOut, addr Message3
    invoke StdOut, addr SumString
    invoke StdOut, addr Message4
    invoke StdOut, addr SubString
    invoke ExitProcess,0
end start