编写一个子程序,计算sin(x)。并在屏幕中间显示结果。 源代码: assume cs:codesg codesg segment start: mov al,60 call showsin mov ax,4c00h int 21h showsin: jmp short show table dw ag0,ag30,ag60,ag90,ag120,ag150,ag180 ag0 db '0',0 ag30 db '0.5',0 ag60 db '0.866',0 ag90 db '1',0 ag120 db '0.866',0 ag150 db '0.5',0 ag180 db '0',0 show: push ax push es push si mov bx,0b800h mov es,bx mov ah,0 mov bl,30 div bl mov bl,al mov bh,0 add bx,bx mov bx,table[bx] mov si,160*12+40*2 shows: mov ah,cs:[bx] cmp ah,0 je showret mov es:[si],ah mov byte ptr es:[si+1],0a0h inc bx add si,2 jmp short shows showret: pop si pop es pop bx ret codesg ends end start