我的程序遇到了问题。我试图让用户输入0-400之间的数字，然后从那里继续。我已经检查了用户输入的情况，它会照顾好所有这些。我失踪并需要帮助的最后一部分是当用户输入像“2aaeios”这样疯狂的东西时，它将其注册为“2”并将循环比较2到0并将jg变为“Case12”
如何强制用户输入0-400之间的数字并推送ErrorExit情况呢？
INCLUDELIB C:\asmIrvine\Examples\Lib32\Irvine32_Library\Irvine32.lib
INCLUDE C:\asmIrvine\Examples\Lib32\Irvine32.inc
.data
ask_GPA BYTE "Please enter your GPA: ", 0
ask_UNITS BYTE "How many units are you taking? ", 0
case_noerror12 BYTE "Congratulations! Your GPA allows you to take up to 12 units.", 0
case_noerror16 BYTE "Congratulations! Your GPA allows you to take up to 16 units.", 0
case_noerror24 BYTE "Congratulations! Your GPA allows you to take up to 24 units. ", 0
invalid BYTE "Your entry is invalid. ", 0
quiter BYTE "You have exceeded the amount of tries. The program will now exit.", 0
GPA DWORD 0
units DWORD 0
.code
main PROC
mov ebx, 0
mov esi, 0
mov ecx, 0
L1:
mov edx, OFFSET ask_GPA
call WriteString
call readdec
mov GPA, eax
mov eax, 350
mov eax, GPA
cmp eax, 400 ;compare to 400
jg Errorexit ;if higher than 400, errorexit
cmp eax, 350 ;compare to 350
jg Case24 ;if higher than 350, ask how many units to take
cmp eax, 250
jg Case16
cmp eax, 0
jg Case12
jmp Errorexit
Case24:
mov edx, OFFSET ask_UNITS ;ask for unit
call WriteString
call readdec
mov units, eax
cmp eax, 24
jg ErrorCounter ;if unit OVER 24, ERROR
cmp eax, 0
jl ErrorCounter ;if unit LESS than 0, ERROR
mov edx, OFFSET case_noerror24 ;else, successful message
call WriteString
jmp Quit
Case16:
mov edx, OFFSET ask_UNITS
call WriteString
call readdec
mov units, eax
cmp eax, 16
jg ErrorCounter
cmp eax, 0
jl ErrorCounter
mov edx, OFFSET case_noerror16
call WriteString
jmp quit
Case12:
mov edx, OFFSET ask_UNITS
call WriteString
call readdec
mov units, eax
cmp eax, 12
jg Errorexit
cmp eax, 0
jl ErrorCounter
mov edx, OFFSET case_noerror12
call WriteString
jmp quit
ErrorCounter:
inc ecx
cmp ecx, 3
je quiterror
jmp L1
Errorexit:
mov edx, OFFSET invalid
call WriteString
jmp ErrorCounter
quiterror:
mov edx, OFFSET quiter
call WriteString
jmp quit
Quit:
exit
INVOKE ExitProcess, 0
main ENDP
END main