C++ rand() Simulate tossing a coin many times

#include <iostream>
#include <cmath>
#include <ctime>
using namespace std;
int main()//  ww  w.  ja  v  a2  s.c  om
{
   const int NUMTOSSES = 1000;
   int heads = 0;  // initialize heads count
   int tails = 0;  // initialize tails count
   int i;
   double flip, perheads, pertails;
   srand(time(NULL));
   for (i = 1; i <= NUMTOSSES; i++)
   {
      flip = double (rand())/RAND_MAX; // scale the number between 0 and 1
      if (flip > 0.5)
         heads = heads + 1;
      else
         tails = tails + 1;
   }
   perheads = (heads / double (NUMTOSSES)) * 100.0;
   pertails = (tails / double (NUMTOSSES)) * 100.0;
   cout << "\nHeads came up " << perheads << " percent of the time";
   cout << "\nTails came up " << pertails << " percent of the time" << endl;
   return 0;
}