5.2 通用代码，数组求和，拷贝数组，si配合di翻转数组

1. 通用代码

• 通用代码类似于一个用汇编语言写程序的一个框架，也类似于c语言的头文件编写

assume cs:code,ds:data,ss:stack
data segment

data ends

stack segment

stack ends

code segment
    start:
    
    mov ax,data
    mov ds,ax
    
    mov ax,4c00h
    int 21h

code ends
end start

2. 数组求和

assume cs:code,ds:data,ss:stack
data segment
	arr db 1,2,3,4,10,20,30,40
	db 'hello world'
data ends

stack segment
	db 100 dup (0)
stack ends

code segment
    start:
    
    mov ax,data
    mov ds,ax
	
	mov ax,0
	mov bx,0
	mov cx,8
	for:
		add al,ds:arr[bx]
		adc ah,0
		inc bx
	loop for
    
    mov ax,4c00h
    int 21h

code ends
end start

comment*
vector<int>arr={1,2,3,4,10,20,30,40};
int sum = 0;
for (int = 0;i < arr.size();i++)sum += arr[i];
*comment

3. 拷贝数组

assume cs:code,ds:data,ss:stack
data segment
	arr db 1,2,3,4,10,20,30,40
	res db 8 dup (0)
data ends

stack segment
	db 100 dup (0)
stack ends

code segment
    start:
    
    mov ax,data
    mov ds,ax
	
	mov bx,0
	mov cx,8
	for:
		mov al,ds:arr[bx]
		mov ds:res[bx],al
		inc bx
	loop for
    
    mov ax,4c00h
    int 21h

code ends
end start

comment*
vector<int>arr={1,2,3,4,10,20,30,40};
int res[8]
for (int i = 0;i < 8;i++)res[i] = arr [i];
*comment

4. 反转数组

assume cs:code,ds:data,ss:stack
data segment
	arr db 1,2,3,4,10,20,30,40
	res db 8 dup (0)
data ends

stack segment
	db 100 dup (0)
stack ends

code segment
    start:
    
    mov ax,data
    mov ds,ax
	
	mov si,0
	mov di,7
	mov cx,8
	for:
		mov al,arr[si]
		mov ds:res[di],al
		inc si
		dec di
	loop for
    
    mov ax,4c00h
    int 21h

code ends
end start

comment*
vector<int>arr={1,2,3,4,10,20,30,40};
int res[8]
for (int i = 0;i < 8;i++)res[7-i] = arr [i];
for (int i = 0,j=7;i<8;i++,j--)res[j] = arr[i];
*comment