strlen.asm

.486
.model flat, stdcall
option casemap :none

include \masm32\include\masm32rt.inc

.data
    text BYTE "toi co the di tren thuy tinh ma khong bi gi", 0
    
.code
start:
    mov eax, 0
    mov ebx, OFFSET text

    len_loop:
        cmp BYTE PTR [ebx], 0
        je len_finally
        inc eax
        inc ebx
        jmp len_loop
        
    len_finally:
        print str$(eax), 13, 10
        ret

end start