C Program to find twin prime numbers, twin Prime Numbers by using C language

C Program to find twin prime numbers, twin Prime Numbers by using C language

void main()
{
  int n,i,k,r,ary[50],p;
  clrscr();
  printf(" Enter Maximum Value For Numbers: ");
  scanf("%d",&r);
  i=1;
  p=0;
  while(i<=r)
  {
     k=0;n=1;
     while(n<=i)
     {
        if(i%n==0)
            k++;
            n++;
     }
     if(k==2)
     {
        ary[p]=i;
        p++;
     }
     i++;
  }

  for(n=0;n<p;n++)
  {
      if(ary[n+1]-ary[n]==2)
      printf("\n %d and %d are TWIN PRIME Numbers ",ary[n],ary[n+1]);
  }
  getch();
}