CODEWITHSUNDEEP
assemblyx86masmirvine32
Peter Jason
Peter Jason

Reputation: 33

Add two variables in assembly

I have the next program in Assembler MASM, I have a question about the sum records for Assembler MASM

 TITLE Suma variables
 INCLUDE Irvine32.inc
 .data
 a dword 10000h
 b dword 40000h
 valorFinal dword ?
.code
 main PROC
       mov eax,a ; empieza con 10000h
       add eax,b ; suma 40000h
       mov valorFinal,eax ; 
      call DumpRegs
      exit
 main ENDP
 END main

My question is when I use add with b, I'm adding only the value of the variable, or am I adding value and address in memory, because I understand that to get the particular value must be enclosed in [].

Upvotes: 3

Views: 11570

Answers (1)

Michael
Michael

Reputation: 58457

because I understand that to get the particular value must be enclosed in []

In NASM syntax you would need brackets.
In MASM/TASM syntax you don't, and add eax,b means the same thing as add eax,[b] (assuming that b is a label and not something like b EQU 42).

If you wanted to add b's address to eax in MASM/TASM syntax you would write: 

add eax, offset b

Upvotes: 5

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