大家好，节日快乐！
我遇到这个作业问题，说：A string of bytes 'input' is given together with two additional strings of N bytes each, 'src' and 'dst'. Obtain a new string of bytes called 'output' from the 'input' string, by replacing all the bytes with the value src[i] with the new value dst[i], for i=1..N.
例如：
input: 1,5,4,7,9,3,4,1,5
src: 1,2,3,4
dst: 9,8,7,6
output: 9,5,6,7,9,7,6,9,5
我在这门课程上不是很出色，我正在努力提高！我已经考虑过使用嵌套循环来解决此问题（我想不出其他任何方式），并且提出了以下代码：（我会把它完整地表达出来，以便任何想要的人都可以尝试）
Bits 32
global start
extern exit; tell nasm that exit exists even if we won't be defining it
import exit msvcrt.dll; exit is a function that ends the calling process. It is defined in msvcrt.dll
; our data is declared here (the variables needed by our program)
segment data use32 class=data
input db 1,5,4,7,9,3,4,1,5
len equ $-input ;size of inputs
src db 1,2,3,4
dst db 9,8,7,6
n equ 4 ;size n of src and dst
output db 0 ; output: 9,5,6,7,9,7,6,9,5
count dd 0 ; I use this count to keep track of ECX for the loops
; our code starts here
segment code use32 class=code
start:
mov esi,input ;in esi we will store the FAR address of the string "input"
cld ;parse the string from left to right(DF=0).
mov ecx,len ;we will parse the elements of the string in a loop with len iterations.
repeat:
mov count,[ecx]
mov ecx,[n]
mov edi,src ;in edi we will store the FAR address of the string "src"
repeat2:
cmpsb
JE et:
mov output,[esi]
et:
mov edx,[edi+4]
mov output,[edx]
loop repeat2
mov ecx,count
loop repeat
sfarsit:
push dword 0; push the parameter for exit onto the stack
call [exit]; call exit to terminate the program
该代码不起作用！汇编器给我这些错误： 操作码和操作数的无效组合 对于25、30、31和34行，它们是：
25.mov count,[ecx]
30.JE et:
31.mov output,[esi]
34.mov output,[edi]
这就是我现在得到的...
CPU Disasm
Address Hex dump Command Comments
00402006 8B DB 8B
00402007 0D DB 0D ; Carriage Return
00402008 09 DB 09 ; TAB
00402009 00 DB 00
0040200A 00 DB 00
0040200B 00 DB 00
0040200C 8A DB 8A
0040200D 11 DB 11
0040200E 88 DB 88
0040200F 15 DB 15