i'm writing a code to receive password input. Below is my code... the program run well but the problem is other keys beside than numerical and alphabet characters also being read, for example delete, insert, and etc. can i know how can i avoid it? tq...

```
string pw="";
char c=' ';

while(c != 13) //Loop until 'Enter' is pressed
{
    c = _getch();
    if(c==13)
        break;

    if(c==8)
    {
        if(pw.size()!=0)   //delete only if there is input 
        {
            cout<<"\b \b";
            pw.erase(pw.size()-1);
        }
    }

    if((c>47&&c<58)||(c>64&&c<91)||(c>96&&c<123))  //ASCii code for integer and alphabet
    {
        pw += c;
        cout << "*";
    }
}

```