[LeetCode] Length of Last Word

Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example, 
Given s = "Hello World",
return 5.

解题思路：

注意“a ”这种情况仍然返回1，而不是0。另外，const char* 不能直接赋值给char*变量，需要强制转换，而反过来是可以的。

代码如下：

class Solution {public:    int lengthOfLastWord(const char *s) {        int length=0;        char* c=(char*)s;        while(*c!='\0'){            if(*c!=' '){                length++;            }else if(*c==' '&&*(c+1)!=' '&&*(c+1)!='\0'){                length=0;            }            c=c+1;        }        return length;    }};