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xt7-2.asm
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;文件名：xt7-2.asm
;文件说明：第7章习题第2题
jmp near start
posi db 'P',0x07,'o',0x07,'s',0x07,'i',0x07,'t',0x07,'i',0x07,'v',0x07,'e',0x07,':',0x07
posiend db ' ',0x04
nega db 'N',0x07,'e',0x07,'g',0x07,'a',0x07,'t',0x07,'i',0x07,'v',0x07,'e',0x07,':',0x07
negaend db ' ',0x04
data1 db 0x05,0xff,0x80,0xf0,0x97,0x30 ;6个数
data2 dw 0x90,0xfff0,0xa0,0x1235,0x2f,0xc0,0xc5bc ;7个数
start:
mov ax,0x7c0 ;设置数据段基地址
mov ds,ax
mov ax,0xb800 ;设置附加段基地址
mov es,ax
cld
mov si,posi
mov di,0 ;输出第一行文字
mov cx,(posiend-posi)/2
rep movsw
cld
mov si,nega
mov di,160 ;输出第二行文字
mov cx,(negaend-nega)/2
rep movsw
xor ax,ax ;ax清0，用于保存正负数个数
;得到data1所代表的偏移地址
mov bx,data1
mov si,0
xor dx,dx
mov cx,6
data1cmp: ;计算data1的正数和负数个数
mov dl,[bx+si]
inc si
cmp dl,0
jg data1posi
jl data1nega
loop data1cmp ;循环判断正负
jmp data1cmpover ;结束跳出data1cmp
data1posi:
inc ah ;ah保存正数个数
loop data1cmp
jmp data1cmpover
data1nega:
inc al ;al保存负数个数
loop data1cmp
data1cmpover:
;得到data2所代表的偏移地址
mov bx,data2
mov si,0
xor dx,dx
mov cx,7
data2cmp: ;计算data2的正数和负数个数
mov dx,[bx+si]
add si,2
cmp dx,0
jg data2posi
jl data2nega
loop data2cmp ;循环判断正负
jmp data2cmpover ;结束跳出data2cmp
data2posi:
inc ah
loop data2cmp
jmp data2cmpover
data2nega:
inc al
loop data2cmp
data2cmpover:
show:
add ax,0x3030 ;将正数负数个数转换为字符
mov di,0+posiend-posi
mov [es:di],ah
mov di,160+negaend-nega
mov [es:di],al
jmp near $
times 510-($-$$) db 0
db 0x55,0xaa