0058.length_of_last_word_E.c

/**
 * https://leetcode.com/problems/length-of-last-word/description/
 * 2015/07
 * 0 ms
 */

int lengthOfLastWord(char * s)
{
    int length = 0;
    int idx = strlen(s) - 1;
    while(s[idx] == ' ')
        idx --;
    
    for(; idx >= 0; idx --)
    {
        if((s[idx] >= 'a' && s[idx] <= 'z') || (s[idx] >= 'A' && s[idx] <= 'Z'))
        {
            length ++;
        }
        else
        {
            break;
        }
    }
    return length;
}