How to delete a character in password masking c++ - c++

Question

I'm currently making a login form for my project, but I can't move on on this one. I want my program to delete a character(in password) when I'm pressing the backspace button, but the program is not reading it.
Here's my code
string username, password, power;
char ast=' ';
int aste = 0, accessLevel;
ofstream addAcc;
addAcc.open("Accounts.txt");
cout<<"Username: ";cin.ignore();getline(cin, username);
cout<<"Password: ";
do
{
ast = getch();
if (ast == 13 || ast == ' ' )
{
break;
}
if(ast==8 || password!="")
{
cout<<"\b \b";
password.erase(password.size()-1);
}
cout<<"*";
password+=ast;
aste ++;
}while(ast!=13 || ast!=' ');
do
{
cout<<"Enter Access Level(0-1): ";cin>>accessLevel;
switch(accessLevel)
{
case 0:
{
power = "Cashier";
break;
}
case 1:
{
power = "Manager";
break;
}
default:
cout<<"Invalid access level."<<endl;
}
}while(accessLevel>1||accessLevel<0);
Thank you for those who will help.

Answer 1

On some platforms getch() will return the DEL character (ascii 127) when you hit BACKSPACE. So change your line
if(ast==8 || password!="")
to
if((ast==8 || ast==127) && !password.empty())
You probably don't want to erase a character everytime that password is not an empty string either, so I removed || password!="" from the condition too. Instead you want to erase one character only if the password is not empty. So you need an && instead of an ||.
Also note, that you're adding the character returned by getch() unconditionally. So if the user enters BACKSPACE, you erase the last character, but append BACKSPACE to the password. So you should only append the character returned by getch() if it was not a BACKSPACE (or DEL).
Thus your code might look like this:
if((ast==8 || ast==127) && !password.empty())
{
cout<<"\b \b";
password.erase(password.size()-1);
aste--;
}
else
{
password+=ast;
cout<<"*";
aste++;
}

Answer 2

do
{
c = _getch();
if (c == 13 || c == ' ') // checking ascii key 13 pressed or no
{
break;
}
if (c == 8 || c == 127)
{
if (Password.size() != 0){
cout << "\b \b";
Password.erase(Password.size() - 1);
StarNum--;
}
}
else {
Password += c;
cout << "*";
StarNum++;
}
} while (c != 13 || c != ' ');

Answer 3

Use
#include <conio.h>
and
ch = _getch();
instead ch = getch();
and also change the condition like this
if(ch == 8)
{
password.erase(password.size()-1);
aste--;
}else
{
password +=ch;
aste++;
}