算法设计与应用基础作业第一周

520. Detect Capital     

Description：

Given a word, you need to judge whether the usage of capitals in it is right or not.

We define the usage of capitals in a word to be right when one of the following cases holds:

1. All letters in this word are capitals, like "USA".
2. All letters in this word are not capitals, like "leetcode".
3. Only the first letter in this word is capital if it has more than one letter, like "Google".

Otherwise, we define that this word doesn't use capitals in a right way.

Example 1:

Input: "USA"Output: True

Example 2:

Input: "FlaG"Output: False

Note: The input will be a non-empty word consisting of uppercase and lowercase latin letters.

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分析：题目的意思是判断大写字母的用法是否正确。正确的用法有三种：

           一、单词中全部字母都是大写字母；

           二、单词中全部字母都是小写字母；

           三、单词中只有首字母是大写字母并且该单词有多于一个字母；

           结合ASCLL表格很容易就用if语句写出程序。

          

My C++ code :

class Solution {public:    bool detectCapitalUse(string word) {        int up = 0 ;        int low = 0 ;        int length = word.length() ;        for (int i = 0 ; i < length ; i ++ )        {            if(word[i] < 91) up ++ ;            if(word[i] > 96) low ++ ;        }        if (up == length || low == length) return true ;        else if (up == 1 && low ==length - 1 && word[0] < 91 && length > 1) return true ;        else return false ;    }};

PS:上次写过第一周的作业了，这周回顾的时候发现全都是乱码。于是重新写过