[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,0
        
        mov cx,5
    s:    mov al,[bx]
        and al,11011111B
        mov [bx],al
        inc    bx
        loop s
        
        mov cx,5
        mov bx,5
    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,0
        
        mov cx,5
    s:    mov al,[bx]
        and al,11011111B
        mov [bx],al
        
        mov al,[5 + bx]
        or    al,00100000B
        mov    [5 + 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,0
        
        mov cx,5
    s:    mov al,0[bx]
        and al,11011111B
        mov [bx],al
        
        mov al,5[bx]
        or    al,00100000B
        mov    5[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[5] = "BaSiC";
    char b[5] = "MinIX";
    
    int i = 0;
    do
    {
        a[i] = a[i] & 0xDF; //小->大
        b[i] = b[i] | 0x20; //大->小
        printf("%c",a[i]);
        i++;
    }
    while (i < 5);
    
    printf("
");
    
    for(i = 0; i < 5; i++)
    {
        
        printf("%c",b[i]);
    }
    printf("
");
    
    system("PAUSE");
    return 1;
}

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