#include <iostream>
using namespace std;
int main(void)
{
   void perm(char *a,int,int);
   char a[5]={'A','B','C','D','E'};
   perm(a,0,5);
   system("pause");
   return 0;
}
void perm(char *a,int k,int n)
{
    if (k==n-1)  //输出一种排列
    {
       for(int i=0;i <n;i++)
          cout<<a[i]<<"  ";
       cout<<endl;
    }
    else
      for (int j=k;j <n;j++)                 //产生{a[k],....a[n-1]}各种排列
      {
         int t;
         t = a[k]; a[k] = a[j]; a[j] = t;
         perm(a,k+1,n);                     //产生{a[k+1]....a[n-1]}各种排列
         t = a[k]; a[k] = a[j]; a[j] = t;
      }
}