how create a sequence of random number

I wrote this code to generate a sequence of random number but this program give me the same random number:

 int _tmain(int argc, _TCHAR* argv[])

{

   for (int i=0;i<100;i++){
       srand((unsigned)time(0));
       cout<<"\t"<<rand();
    }
  getchar();
   return 0;
}

the output is a sequence with equal number how i can solve this problem.