分析

簡單的字串合法性檢測，只能是首字母大寫或全字母大寫。

bool detectCapitalUse(char* word) {
    int wordLen = strlen(word);
    int i = 0;
    int stat = 0;

    if ((word[0] >= 'A') && (word[0] <= 'Z'))
    {
        if (word[wordLen - 1] >= 'A' && word[wordLen - 1] <= 'Z')
        {
            /* 所有大寫 */
 

            stat = 1;
        }
        else
        {
            /* 後續小寫 */
            stat = 2;
        }
    }
    else
    {
        /* 所有小寫 */
        stat = 3;
    }

    for (i = 1; i < wordLen; i++)
    {
        if (stat == 1)
        {
            if ((word[i] >= 'a') && (word[i] <= 'z'
 
))
            {
                return false;
            }
        }
        else
        {
            if ((word[i] >= 'A') && (word[i] <= 'Z'))
            {
                return false;
            }
        }
    }

    return true;
}