-

Author: liuchuo

C++/520. Detect Capital.cpp

@@ -0,0 +1,33 @@
+520. Detect Capital
+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:
+
+All letters in this word are capitals, like "USA".
+All letters in this word are not capitals, like "leetcode".
+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
+
+题目大意：判断一个字母是否大小写正确：要么全是大写，要么全是小写，或者首字母大写其他小写，否则不满足题意～
+分析：判断word[0]和word[1]的大小写，如果word[0]是小写，那后面必须是小写，如果word[0]是大写word[1]是小写，那后面也必须是小写，如果word[0]是大写word[1]也是大写那么后面必须都是大写～
+
+class Solution {
+public:
+    bool detectCapitalUse(string word) {
+        if (word.length() <= 1) return true;
+        if (islower(word[0]) || (isupper(word[0]) && islower(word[1]))) {
+            for (int i = 1; i < word.length(); i++)
+                if (isupper(word[i])) return false;
+        } else {
+            for (int i = 1; i < word.length(); i++)
+                if (islower(word[i])) return false;
+        }
+        return true;
+    }
+};