【LeetCode】 Length Of LastWord

int LengthOfLastWord(string str)
{
	int end = str.length() - 1;
	int len = 0;
	if (str[end] == ' ')
		return 0;
	while (str[end] != ' ')
	{
		if (end == -1)
		{
			break;
		}
		else
		{
			len++;
			end--;
		}
	}
	return len;
}
int LengthOfLastWord2(const char *input)
{
	int len = 0;
	while (*input)
	{
		if (*input++ != ' ')
			len++;
		else if (*input && *input!=' ')
		{
			len = 0;
		}
	}
	return len;
}