我的二等分搜索算法错了吗

Question

如果我问了一个愚蠢的问题，我很抱歉，但我有点困惑。。。我一直在edx上MIT6.00X课程，其中一个练习是使用平分搜索算法来找到秘密数字。我花了大约4个小时完成了这个练习（是的，我是个傻瓜），但我成功地构建了这个代码：

numGuesses = 0
lo = 0
hi = 100
mid = (hi + lo)/2
num = raw_input( "Input a number between 0 and 100 ")
if num > 0 or num < 100:
    while mid  != num:
        print ("Is your number " + str(mid) + "?")
        userinput = raw_input( "Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. ")
        if userinput == 'h':
            hi = mid
            mid = (hi + lo)/2
        elif userinput == 'l':
            lo = mid
            mid = (hi + lo)/2
        elif userinput == 'c':
            print ("Game over. Your secret number was:" + str(mid))
            break
        else:
            print ("Sorry, I did not understand your input.")
else:
    print ("You should use a number between 0 and 100")

虽然手工测试它效果很好，但在练习中有一些问题没有通过，主要是因为网站没有一直猜测它是高还是低，有时它按错了键，我没有通过练习。

在尝试更改代码后，我没能完成课程，所以我看到了答案，如果我做错了，我应该使用布尔值来保持代码的流动，直到它找到正确的数字。

我的问题是：我的代码错了吗？此外，我是否犯了任何错误，导致网站无法按正确的字母？只是好奇的

非常感谢

Answer 1

这是我今天终于解决的MITx手指练习之一。这是我的方法：

print('Please think of an integers BETWEEN 0 and 100!')
#Define variable
x=100
low=0
high=x
ans=0
#Guessing code part
while ans<=x:
    print'Is your secret number:', str((low+high)/2), '?'
    s=raw_input("Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly:")
    if s!='h' and s!='l' and s!='c':
        print'Sorry I did not understand your input.'
    elif s=='h':
        high=(low+high)/2
    elif s=='l':
        low=(low+high)/2
    elif s=='c':
        print'Game over. Your secret number is:', str((low+high)/2)
        break

Answer 2

lo = 0
hi = 100
mid = (hi + lo)/2
print 'Please think of a number between 0 and 100!'
while True:
    print ("Is your number " + str(mid) + "?")
    userinput = raw_input( "Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. ")
    if userinput == 'h':
        hi = mid
        mid = (hi + lo)/2
    elif userinput == 'l':
        lo = mid
        mid = (hi + lo)/2
    elif userinput == 'c':
        print ("Game over. Your secret number was:" + str(mid))
        break
    else:
        print ("Sorry, I did not understand your input.")