剑指Offer33 第一个只出现一次的字符

 /*************************************************************************
     > File Name: 33_FirstNotRepeatChar.c
     > Author: Juntaran
     > Mail: JuntaranMail@gmail.com
     > Created Time: 2016年09月02日 星期五 13时43分20秒
  ************************************************************************/

 #include <stdio.h>

 char FirstNotRepeatChar(char* str)
 {
     if (str == NULL)
         return '\0';
     int HashSize = ;
     int hash[HashSize] = {};

     char* key = str;
     while (*key != '\0')
     {
         printf("*key = %d\n", *key);
         hash[*key] ++;
         *key ++;
     }

     key = str;
     while (*key != '\0')
     {
         printf("%d ", hash[*key]);
         if (hash[*key] == )
             return *key;
         key ++;
     }
     return '\0';
 }

 int main()
 {
     char str[] = "adaccbweff";
     char ret = FirstNotRepeatChar(str);
     printf("%c\n", ret);
 }