Prime number cpp program

Cpp program for print prime numbers

#include<conio.h>

#include<math.h>

#include<iostream.h>

class prime

{ private:

          int i,j,n,flag;

  public:

          void getdata();

          void getdisp();

};

void prime::getdata()

{

          cout<<"\n\t PRIME NUMBERS\n\n\n ";

          cout<<"Upto which numbers? : ";

          cin>>n;

}

void prime::getdisp()

{

          cout<<"\n\nPrime numbers up to "<<n<<" are \n\n";

          for(i=2;i<=n;i++)

          {        flag=1;

                   for(j=2;j<=sqrt(i);j++)

                             if(i%j==0)

                             {        flag=0;

                                       break;

                             }

                   if(flag)

                             cout<<i<<"\t";

          }

}

void main()

{

          prime p;

          clrscr();

          p.getdata();

          p.getdisp();

          getch();

}