删除小写字母字符串中重复字符

#include<iostream>  using namespace std;  void DeleteCommonStr(char a[])  {      int i = 0;      while (a[i] != '\0')      {          int j = i + 1;          int k = i + 1;          while (a[k] != '\0')          {              if (a[k] != a[i])              {                  a[j] = a[k];                  ++j;                  ++k;              }              else              {                  ++k;              }          }          a[j] = '\0';          ++i;      }  }  int main()  {      char a[100];      gets(a);      DeleteCommonStr(a);      cout << "删除相同的字符串之后为："<<a << endl;      system("pause");      return 0;  }