Question

;This program reverses a string.
INCLUDE Irvine32.inc
.data
   aName BYTE "Abraham Lincoln",0
   nameSize = ($ - aName) - 1
.code

main PROC
   ; Push the name on the stack.
   mov ecx,nameSize
   mov esi,0
   L1: movzx eax,aName[esi] ; get character
     push eax ; push on stack
     inc esi
   Loop L1
   ; Pop the name from the stack, in reverse,
   ; and store in the aName array.
   mov ecx,nameSize
   mov esi,0
   L2: pop eax ; get character
     mov aName[esi],al ; store in string
     inc esi
   Loop L2
   ; Display the name.
   mov edx,OFFSET aName
   call Writestring
   call Crlf
   exit
   main ENDP
END main

我完成了问题的第一部分，即制作反向字符串程序，但现在我需要修改程序，以便用户可以输入包含1到50个字符的字符串。我不确定如何做到这一点，并想知道是否有人可以提供帮助。这是汇编语言btw

Answer 1

您可以使用ReadString from irvine32.lib。因此，您必须将nameSize更改为变量并增加aName的大小。

我为你做了;-)：

;This program reverses a string.
INCLUDE Irvine32.inc
.data
   aName BYTE 51 DUP (?)
   nameSize dd ?
.code

main PROC

   mov  edx, OFFSET aName
   mov  ecx, 50            ;buffer size - 1
   call ReadString
   mov nameSize, eax

   ; Push the name on the stack.
   mov ecx,nameSize
   mov esi,0
   L1: movzx eax,aName[esi] ; get character
     push eax ; push on stack
     inc esi
   Loop L1
   ; Pop the name from the stack, in reverse,
   ; and store in the aName array.
   mov ecx,nameSize
   mov esi,0
   L2: pop eax ; get character
     mov aName[esi],al ; store in string
     inc esi
   Loop L2
   ; Display the name.
   mov edx,OFFSET aName
   call Writestring
   call Crlf
   exit
   main ENDP
END main

如何输入包含1到50个字符的字符串。（程序集）

1 个答案: