password programming

i got proble in coverting the password to '*' style at the same time that user are key in it. so if they anybody can help me in this case?what should i do? please reply me at [email protected]. tq

#include<iostream>
#include<string>

using namespace std;

class password
{
private:
string name,pw;

public:

void pass()
{
cout<<"\nEnter New userid"<<endl;
cin>>name;
cout<<"Enter New password"<<endl;
cin>>pw;
cout<<"\b";
compare(name,pw);
}

void compare(string nm,string kk)
{
string nama,ps;
cout<<"\n\nEnter userid"<<endl;
cin>>nama;
cout<<"Enter password"<<endl;
cin>>ps;

if(nm==nama && kk==ps)
cout<<"correct"<<endl;
else
cout<<"incorrect"<<endl;
}
}

main()

{
password pa;
char ans,answ;

cout<<"DO you want to login? Y/N"<<endl;
cin>>ans;

while(ans=='Y' || ans=='y')
{
cout<<"\n\nAre you the new user? Y/N"<<endl;
cin>>answ;

if(answ=='Y' || answ=='y')

pa.pass();

else if(answ=='N' || answ=='n')
{
cout<<"\n\nSystem already delete your userid and password"<<endl;
cout<<"You need to register again. Thak you\n\n"<<endl;
pa.pass();
}

else
cout<<"system refuse"<<endl;

cout<<"\n\nDO you want to try again? Y/N"<<endl;
cin>>ans;
}
cout<<"\t\t\t\tTHANK YOU TO TRY THE SECURITY SYSTEM"<<endl;
}