实训汇编语言设计——16位数拆分为4组

练习实训：AX中16位数分为4组（1234分为1,2,3,4），每组4位分别放在AL,BL,CL,DL

答:

data segment

data ends

cseg segment

assume cs:cseg,ds:data

start:

mov ax,1234h

mov cl,4

mov dx,ax

and dx,0fh

mov bx,ax

shr bx,cl

and bx,0fh

mov ch,bl

mov bx,ax

shr bx,cl

shr bx,cl

and bx,0fh

shr ax,cl

shr ax,cl

shr ax,cl

and ax,0fh

mov cl,ch

and cx,0fh

mov bh,bl

mov dh,dl

mov dl,al

add dl,40h

mov ah,2

int 21h

mov dl,bh

add dl,40h

mov ah,2

int 21h

 

mov dl,cl

add dl,40h

int 21h

mov dl,dh

add dl,40h

int 21h

mov ah,1

int 21h

exit:

mov ah,4ch

int 21h

cseg ends

end start

输出：ABCD (对应：al=01h,bl=02h,cl=03h,dl=04h)