Question

汇编语言实验：分支程序设计 定义3个单元 若X>=0，Y>=0则a=1；若X<0,Y<0,则a=-1；若X,Y异号，则a=0

x,y的值在-128~127之间

Answer 1

assume cs:code,ds:data
data segment
x db ?
y db ?
a db ?
data ends
code segment
start:
mov ax,data
mov ds,ax
mov al,x
mov bl,y
mov a,0

cmp al,0
jge next1
cmp bl,0
jl next2
mov a,1
jmp exit
next1:
cmp bl,0
jge next2
mov a,-1
jmp exit
next2:
mov a,0
exit:
mov ax,4c00h
int 21h
code ends
end start