help in password

[Hexa]

hi bros i write a code that get pass its not complete but my main problem is
i want to set a code that dont get passwrod over 20 i mean
if 21 entered or higher my code dont accept it and put default value of 20 to c variable
here is my code:

string password;
void pass(void)
{
    char c;
    password="";
    int a=0;
    cout<<"enter password"<<endl;
    while(a<2)
    {
        c=getch();
        if(c==13)
        {
            if(a==0)//enter no number
           {pass();break;}
            else
            break;
        }
        password +=c;
        cout<<"*";
        if(c>='9')
        break;
        a++;
    }


}

[coder777]

Currently you allow just 2 while(a<2) so while(a<20) would to the job?

You don't need 'a' since you can use password.size() anyway

[Hexa]

no mate i dont mean getting 20 character i mean getting 20 i mean just 2 and 0 can be highly number entered i mean c variable can be:
1 2 3 ...20