111

 1 #include <iostream>
 2 #include <string>
 3 using namespace std;
 4  
 5 void FindChar(string &s)
 6 {
 7     int str[256];
 8     for (int i=0;i<256;i++)
 9     {
10         str[i]=0;
11     }
12     for (int i=0;i<s.size();i++)
13     {
14         str[s[i]]++;
15     }
16     for (int i=0;i<s.size();i++)//多谢<a href="http://home.cnblogs.com/u/284122/" target="_blank">justinzhang</a>指出，第二次遍历时应从s中开始
17     {
18         if (str[s[i]]==1)
19         {
20             printf("%c",s[i]);
21             return;
22         }
23     }
24 }
25  
26  
27 int main()
28 {
29     string s;
30     cout<<"请输入字符串"<<endl;
31     cin>>s;
32     FindChar(s);
33     //cout<<FirstNotRepeatingChar(const_cast<char *>(s.c_str()));
34     cout<<endl;
35     system("pause");
36  
37     return 0;
38 }