要求：0到9十個數字隨機組合，但不能相同！！！

#include <stdio.h>

#include <iostream.h>

void main()

{ 

       char a[]={'0','1','2','3','4','5','6','7','8','9'};

       for(int i=0;i<10-1;i++)

       {

              for(int j=i+1;j<10;j++)

                     if(a[i]!=a[j])

                     {

                            cout<<a[i]<<a[j]<<"  ";

                            cout<<a[j]<<a[i]<<"  ";

                     }

              cout<<endl;

       }

}