BEST WAY TO WRITE C PROGRAM TO PRINT NUMBER SERIES

#include
#include
void main()
{
 int num,i,j,count;
 char flag='y';
 clrscr();

 while(flag == 'y' || flag == 'Y')
 {
  clrscr();
  cout<<"\n ENTER THE LIMIT : ";
  cin>>num;
  cout<<"\n THE PRIME NUMBER SERIES IS : ";
  printf("\n 1 \n 2 \n 3 \n");

 for(i=4;i<=num;i++)
 {
  count=2;
  for(j = 2;j < i; j++)
  {
   if(i%j != 0)
   {
    count = count+1;
   }
  }
   if(j == count)
    {
     printf(" %d \n",i);
    }
 }
  printf("\n DO YOU WANT PRINT ANOTHER SERIES (Y/N) : ");
  flag = getch();
 }
}