Listed below are snippets from a prgram to perform input validation for
a username and password. The code to input and validate the username is
in a seperate file than the code to input and validate the password.

Partial code from user.cpp:

namespace Authenticate
{
void inputUserName(){

do
{
cout << "Enter your username (8 letters only)" << endl;
cin >> username;
}
while(!isvalid());

}
string getUserName()
{
return username;
}
}

Define the username variable and the isValid() function in the
unnamed namespace so the code will compile. The isValid() function
should return true if username contians exactly eight letters.
Generate an appropriate header file for the code.
Repeat rhe same steps for the file password.cpp, placing the password
variable and the isValid() function in the unnamed namespace:

namespace Athenticate
{
void inputPassword(){

do
{
cout << "Enter your password (at least 8 characters " <<
"and at leat one non-letter)" << endl;
cin >> password;
}
while(!isValid());
}

string getPassword()
{
return password;
}
}
For passwords, isValid() should require the passwrod to have eight or
more letters and at leat one non-letter, Generate an appropriate header
file for this code as well.
At this pont, you should have two functions named isValid(), each in
different namesapcs. Place the following main function in an appopriate
place. The program should comile and run.

int main()
{
intputUserName();
inputPassword();
cout << "Your username is " << getUserName() <<
"and your password is: " <<
getPassword() << endl;
return 0;
}