汇编:分段函数的值的计算

;分段函数计算
DATAS SEGMENT
X db -1
Y db  3
F db ?
DATAS ends
CODES SEGMENT
    ASSUME CS:CODES, DS:DATAS
    START:
        mov AX,DATAS
        mov DS,AX
        mov ah,x
        mov al,y

        cmp ah,1
        jl r1   
        cmp al,1
        jl r1   ;x小于1或y小于1均跳转

        cmp ah,5
        ja  r3  ;
        cmp al,5
        ja  r3  ;x或y大于5

        jmp r2  ;x或y属于[1,5] 
    r1:
        mov f,-1
        jmp exit        
    r2:
        mov f,0
        jmp exit
    r3:
        mov f,1
        jmp exit
    exit:
        mov ah,4ch
        int 21H
CODES ends
    end START