C++ password masking

问题

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 << "*";
    }
}

回答1:

Filter using isalnum() for alpha-numeric or isalpha() for only alphabets.

Also, you are checking c == 13 twice, following will suffice.

while(1){
  //
  if(c == 13)
    break;
  //
}

---

if( isalnum(c) ){
  // 'c' is acceptable
}

Some assertion is failing during execution which throws that error.

回答2:

If you have access to it, you are much better off using the GNU getpass function.

来源：https://stackoverflow.com/questions/2522754/c-password-masking