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