2020FZU汇编语言学习---实验（四）

4-1

include Irvine32.inc
.data
	buf word 12AFh
	mas byte 4 dup(?)
.code
main proc
	push offset buf
	push offset mas
	call decbin
exit
main endp
decbin proc
	push ebp
	mov ebp,esp
	push esi
	push eax
	push ebx
	push ecx
	push edx
	xor esi,esi
	mov ecx,4
	mov ebx,[ebp+12]   ;取出buf偏移地址
	mov edi,[ebp+8]     ;取出mas首地址
 again:
	mov dx,word ptr [ebx]
	rol dx,4
	mov word ptr[ebx],dx
	and dl ,0fh         ;0fh=(1111)B,取dl低四位
	cmp dl,0ah	 ;<0ah,该位为数字，dl=dl+30h 
	jb num
	add dl,7		 ;字母的Ascii码为dl=dl+7h
num:
	add dl,30h
	mov byte ptr [edi+esi],dl      ;存入mas
	movzx eax,dl		
	call writeint
	call crlf
	inc esi
	loop again
	pop edx
	pop ecx
	pop ebx
	pop eax
	pop esi
ret
decbin endp
end main