[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:

 1 assume cs:code,ds:data
 2 data segment
 3     db 'BaSiC'
 4     db 'MinIX'
 5 data ends
 6 code segment
 7 start:    mov ax,data
 8         mov ds,ax
 9         mov bx,0
10         
11         mov cx,5
12     s:    mov al,[bx]
13         and al,11011111B
14         mov [bx],al
15         inc    bx
16         loop s
17         
18         mov cx,5
19         mov bx,5
20     s0:    mov al,[bx]
21         or    al,00100000B
22         mov    [bx],al
23         inc bx
24         loop s0
25         
26         mov ax,4c00H
27         int 21h
28 code ends
29 end start

方法二:

 1 assume cs:code,ds:data
 2 data segment
 3     db 'BaSiC'
 4     db 'MinIX'
 5 data ends
 6 code segment
 7 start:    mov ax,data
 8         mov ds,ax
 9         mov bx,0
10         
11         mov cx,5
12     s:    mov al,[bx]
13         and al,11011111B
14         mov [bx],al
15         
16         mov al,[5 + bx]
17         or    al,00100000B
18         mov    [5 + bx],al
19         inc bx
20         loop s
21         
22         mov ax,4c00H
23         int 21h
24 code ends
25 end start

方法三:

 1 assume cs:code,ds:data
 2 data segment
 3     db 'BaSiC'
 4     db 'MinIX'
 5 data ends
 6 code segment
 7 start:    mov ax,data
 8         mov ds,ax
 9         mov bx,0
10         
11         mov cx,5
12     s:    mov al,0[bx]
13         and al,11011111B
14         mov [bx],al
15         
16         mov al,5[bx]
17         or    al,00100000B
18         mov    5[bx],al
19         inc bx
20         loop s
21         
22         mov ax,4c00H
23         int 21h
24 code ends
25 end start

C语言编写:

 1 #include <stdio.h>
 2 
 3 int main()
 4 {
 5     char a[5] = "BaSiC";
 6     char b[5] = "MinIX";
 7     
 8     int i = 0;
 9     do
10     {
11         a[i] = a[i] & 0xDF; //小->大
12         b[i] = b[i] | 0x20; //大->小
13         printf("%c",a[i]);
14         i++;
15     }
16     while (i < 5);
17     
18     printf("
");
19     
20     for(i = 0; i < 5; i++)
21     {
22         
23         printf("%c",b[i]);
24     }
25     printf("
");
26     
27     system("PAUSE");
28     return 1;
29 }

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

[汇编语言]-第七章 用[bx+idata]的方式进行数组的处理

[汇编语言]-第七章用[bx+idata]的方式进行数组的处理