程序代码：

#include <iostream>
#include <time.h>
using namespace std;
#define max 7
int main()
{
    int i(0),j,k,l(1),a[max];
    srand((unsigned)time(NULL));
    k=rand()%max;
    a[i]=k;
    k=rand()%max;
    while (i!=max)
    {
        for(j=0;j<=i;j++)
        {
        if(k==a[j])
        l=0;
        }
        if(l)
        {
        i++;
        a[i]=k;
        }
        l=1;
        k=rand()%max;
    }
    for(i=0;i<max;i++)
    {
    cout<<a[i]<<" ";
    }
    cout<<endl;
    return 1;
}