這學期選了一門組合語言，話不多說，直接上程式碼
Converting from big endian to little endian
[code]
TITLE ch4-1
include Irvine32.inc
include Macros.inc
.data
bigE BYTE 12h, 34h, 56h, 78h
littleE DWORD ?
little BYTE 0,0,0,0
.code
main PROC
mov ebx,0
mov ecx, 3
mov esi, offset bigE ;save bigE address
mov edi, offset little ;save little address
L1:
mov al, [esi+ebx]
mov [edi+ecx], al
dec ecx
inc ebx
cmp ebx, 4
jne L1
mov eax, DWORD PTR little ;mov little array into littleE
mov littleE,eax
mov eax,littleE
call WriteHex ;print
call ReadInt
exit
main ENDP
end main</pre>
<pre>[/code]
output:
12345678
copy a string in reverse order
[code]
TITLE ch4-1
include Irvine32.inc
include Macros.inc
.data
source BYTE "1234567890",0
target BYTE SIZEOF source DUP(‘ ‘)
.code
main PROC
mov esi,OFFSET source ;esi ptr of source
mov edi,esi ;edi initial place-1
mov ebp,OFFSET target ;ebp ptr of target
sub edi,1
add esi,SIZEOF source
sub esi,2
L1:
mov al,[esi]
call WriteChar
mov [ebp],al
dec esi ;esi 遞減
inc ebp ;ebp 遞增
call DumpRegs
cmp esi,edi
jne L1
mov edx,OFFSET source ;列印
call WriteString
mov al,0Ah
call WriteChar
mov edx,OFFSET target
call WriteString
call ReadInt
exit
main ENDP
end main
[/code]
output:
1234567890
0987654321
好累，第一次寫，寫三題寫了三個小時= =
寫C大概10分鐘就寫完了QAQ
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