汇编语言王爽 实验10-3 数值显示

Posted 2020-09-20 HelloWord

  1 assume cs:code
  2 data segment
  3     db 10 dup(0)
  4 data ends
  5 
  6 code segment
  7 start:
  8     mov ax,12666
  9     mov bx,data
 10     mov ds,bx
 11     mov si,0
 12     call dtoc
 13 
 14     mov dh,8
 15     mov dl,3
 16     mov cl,2
 17     call show_str
 18 
 19     mov ax,4c00h
 20     int 21h
 21 
 22 dtoc:
 23     push ax
 24     push cx
 25     push bx
 26     push dx
 27     push si
 28     push di
 29 
 30 
 31     mov bx,10
 32     mov di,0
 33 
 34 s0:
 35     mov dx,0
 36     div bx
 37     add dx,30h
 38     
 39     push dx ;用栈存储倒序的余数
 40     inc di
 41 
 42     mov cx,ax
 43     
 44     jcxz ok0
 45 
 46     jmp short s0
 47 ok0:
 48     
 49 
 50     mov cx,di
 51 s1:    
 52     pop ax     ;正序显示
 53     mov [si],al
 54     inc si
 55 
 56     loop s1
 57 
 58     pop di
 59     pop si
 60     pop dx
 61     pop bx
 62     pop cx
 63     pop ax
 64     ret
 65 
 66 
 67 show_str:
 68     push ax  ;子程序用到的寄存器入栈
 69     push bx
 70     push cx
 71     push di
 72     push si
 73 
 74 
 75     mov ax,0b800h
 76     mov es,ax
 77     
 78     mov al,160
 79     dec dh
 80     mul dh
 81     mov bx,ax ;计算行偏移
 82 
 83     dec dl
 84     mov al,dl
 85     mov ah,0
 86     add bx,ax;计算列偏移
 87 
 88     mov di,0
 89     mov al,cl
 90 s:    
 91     mov ch,0
 92     mov cl,ds:[si]
 93     
 94     jcxz ok
 95 
 96     mov ch,al
 97 
 98     mov es:[bx+di],cx
 99     add di,2
100     inc si
101     loop s
102 ok:
103     pop si
104     pop di
105     pop cx
106     pop bx
107     pop ax
108     ret
109 
110 code ends
111 end start