writebin.asm

想学习汇编语言的

TITLE Displaying Binary Bits                (WriteBin.asm)

; Display a 32-bit integer in binary.
; Last Update: 07/22/01

INCLUDE Irvine16.inc

.data
binValue DWORD 1234ABCDh		; sample binary value
buffer BYTE 32 dup(0),0

.code
main PROC
	mov ax,@data
	mov ds,ax

	mov eax,binValue		; number to display
	mov ecx,32		; number of bits in EAX
	mov esi,offset buffer

L1:	shl eax,1		; shift high bit into Carry flag
	mov BYTE PTR [esi],'0'		; choose 0 as default digit
	jnc L2		; if no Carry, jump to L2
	mov BYTE PTR [esi],'1'		; else move 1 to buffer

L2:	inc esi		; next buffer position
	loop L1		; shift another bit to left

	mov edx,OFFSET buffer		; display the buffer
	call WriteString
	call Crlf
	exit
main ENDP
END main