汇编实验记录

1已知DATAX和DATAY单元各存放一个带符号字节数据，从键盘上接收加（＋）、减（－）、乘（*）或除（/）符号，然后完成相应运算，结果存入RLT单元。

代码如下：  
data segment
datax db 5h
datay db 3h
rlt db 1 dup(?)
data ends
code segment
assume cs:code,ds:data
start: mov ax,data
mov ds,ax
mov bl,datax
mov bh,datay
mov ah,01h
int 21h
cmp al,'+'
je jiafa
cmp al,'-'
je jianfa
cmp al,'*'
je chf
cmp al,'/'
je chufa
chufa:
mov al,bl
sub ah,ah
div bh
mov bl,al 
jmp q5
chf:
mov al,bh
mul bl
mov bl,al
jmp q5
jianfa: sub bl,bh
jmp q5
jiafa: add bl,bh
q5: mov al,bl
mov cl,4
shr al,cl
add al,30h
cmp al,39h
jbe xianshi1
add al,07h
xianshi1:mov dl,al
mov rlt,al
mov ah,02h
int 21h
mov al,bl
and al,0fh
add al,30h
cmp al,39h
jbe xianshi2
add al,07h
xianshi2: mov dl,al
mov rlt,al
mov ah,02h
int 21h
mov ah,4ch
int 21h
code ends
end start

效果图：