[汇编语言]-第七章 用[bx+idata]的方式进行数组的处理

1- 转化为大写

方法一:

 assume cs:code,ds:data
 data segment
     db 'BaSiC'
     db 'MinIX'
 data ends
 code segment
 start:    mov ax,data
         mov ds,ax
         mov bx,

         mov cx,
     s:    mov al,[bx]
         and al,11011111B
         mov [bx],al
         inc    bx
         loop s

         mov cx,
         mov bx,
     s0:    mov al,[bx]
         or    al,00100000B
         mov    [bx],al
         inc bx
         loop s0

         mov ax,4c00H
         int 21h
 code ends
 end start

方法二:

 assume cs:code,ds:data
 data segment
     db 'BaSiC'
     db 'MinIX'
 data ends
 code segment
 start:    mov ax,data
         mov ds,ax
         mov bx,

         mov cx,
     s:    mov al,[bx]
         and al,11011111B
         mov [bx],al

         mov al,[ + bx]
         or    al,00100000B
         mov    [ + bx],al
         inc bx
         loop s

         mov ax,4c00H
         int 21h
 code ends
 end start

方法三:

 assume cs:code,ds:data
 data segment
     db 'BaSiC'
     db 'MinIX'
 data ends
 code segment
 start:    mov ax,data
         mov ds,ax
         mov bx,

         mov cx,
     s:    mov al,0[bx]
         and al,11011111B
         mov [bx],al

         mov al,5[bx]
         or    al,00100000B
         mov    [bx],al
         inc bx
         loop s

         mov ax,4c00H
         int 21h
 code ends
 end start

C语言编写:

 #include <stdio.h>

 int main()
 {
     char a[] = "BaSiC";
     char b[] = "MinIX";

     int i = ;
     do
     {
         a[i] = a[i] & 0xDF; //小->大
         b[i] = b[i] | 0x20; //大->小
         printf("%c",a[i]);
         i++;
     }
     while (i < );

     printf("\n");

     for(i = ; i < ; i++)
     {

         printf("%c",b[i]);
     }
     printf("\n");

     system("PAUSE");
     return ;
 }

C语言定位方式: a[i], b[i]

汇编语言定位方式: 0[bx], 5[bx]

[bx+idata]的方式为高级语言实现数组提供了便利机制