汇编语言-计算立方值

1． 题目：计算给定数字的立方值

2．
要求：从键盘输入0至9中任一自然数x，求其立方值。若输入的字符不是0至9之间的数字，则显示错误信息，并要求重新输入。要求有信息提示输入数字、显示计算结果和提示输入错误。

提示：用户输入字符首先判断是否是0至9之间的字符，如果是，则转换为整数并计算其立方值，然后显示结果；如果不是，则显示输入错误信息并等待用户重新输入

训练目的：掌握简单的循环结构，分支结构。

 1 ; Example assembly language program --

 2 ; Author:  karllen

 3 ; Date:    revised 5/2014

 4

 5 .386

 6 .MODEL FLAT

 7

 8 ExitProcess PROTO NEAR32 stdcall, dwExitCode:DWORD

 9

10 INCLUDE io.h            ; header file for input/output

11

12 cr      EQU     0dh     ; carriage return character

13 Lf      EQU     0ah     ; line feed

14

15 .STACK  4096            ; reserve 4096-byte stack

16

17 .DATA

18         promot1  BYTE "Enter a number from 0 to 9 to",cr,Lf

19                  BYTE "calculate it‘s cubic number",cr,Lf,0

20         promot2  BYTE "The number ",0

21

22         value    BYTE 11 DUP(?)

23         warning  BYTE "The number is wrong,please enter a new number"

24                  BYTE cr,Lf

25                  BYTE "from 0 to 9",cr,Lf,0

26         answer   BYTE "The number cubic number is"

27         cubicnm  BYTE 11 DUP(?)

28                  BYTE cr,Lf,0

29 .CODE

30 _start:

31         output   promot1

32         output   promot2

33         input    value,11

34         atod     value

35         doWhiCmp:

36                  cmp eax,0

37                  jl  endWhiCmp  ;eax < 0

38                  cmp eax,9

39                  jg  endWhiCmp  ;eax > 9

40

41                  jmp doRight    ;0<=eax<=9

42

43

44         endWhiCmp:              ;deal the wrong number,to enter new number

45                  output warning

46                  input  value,11

47                  atod   value

48                  jmp    doWhiCmp

49

50         doRight:

51                  mov    ebx,eax

52                  mul    ebx       ;eax = eax * eax

53                  mul    ebx       ;eax = eax * eax *eax

54

55                  dtoa   cubicnm,eax

56                  output answer

57

58               INVOKE  ExitProcess, 0  ; exit with return code 0

59

60 PUBLIC _start                   ; make entry point public

61

62 END                             ; end of source code

汇编语言-计算立方值