Question

Assembly language - please post with output

Question:
Using the AddTwo program from class lecture as a reference, write a program that calculates the following expression, using registers: A = (A + B) - (C + D). Assign integer values to the EAX, EBX, ECX, and EDX registers.

Answer 1

Program:

INCLUDE Irvine32.inc
.386
.stack 10
.data
A byte 12                                                                     ; declaration and initialization of the variables
B byte 6
C byte 2
D byte 7
.code                                                                          ; code part
main PROC                                                                ; begin of main
mov eax,00000000                                                     ; replace the eax register with all zeroes
mov al,C                                                                     ; move the value of C to al
add D                                                                          ; performing (C + D)
call dumpregs                                                             ; printing the values of the registers
mov ebx, 0                                                                  ; replace the ebx register with all zeroes
mov bl,A                                                                      ; move the value of A to al register
add bl,B                                                                       ; performing (A + B)
call dumpregs                                                              ; printing the values of the registers
mov ecx,00000000                                                      ; replace the ecx register value with all zeroes
mov cl,bl                                                                       ; move the value of (A+B) to cl
sub cl,al                                                                        ; perform content of (cl) - (C + D) and store the result in cl register
call dumpregs                                                               ; printing the values of the registers
main endp                                                                     ; end of main
end main

Hope this helps.