Unable to Count Number of Digits as the Input - c++

Question

My Program: To get input from the user about personal details and then output the information.
My Problem: The program is unable to count the number of digits as the input for Phone Number field. It accepts more than 10-digits as an input for the phone number.
My Goal: To check the input for 'Phone Number' and make sure that the number is 10-digits.
My Code:
#include <iostream>
#include <string>
#include <limits>
using namespace std;
class Personal_Details
{
public:
void setFirstName (string newFirstName);
void setLastName (string newLastName);
void setBirthdate (int newBirthday);
void setEMail (string newEMail);
void setPhoneNumber (int newPhoneNumber);
void QUESTIONS();
string getFirstName();
string getLastName();
string getEMail();
int getPhoneNumber();
int getBirthdate();
private:
string FirstName;
string LastName;
string EMail;
int PhoneNumber;
int Birthdate;
};
void Personal_Details :: setFirstName (string newFirstName)
{
FirstName = newFirstName;
}
void Personal_Details :: setLastName (string newLastName)
{
LastName = newLastName;
}
void Personal_Details :: setBirthdate (int newBirthdate)
{
Birthdate = newBirthdate;
}
void Personal_Details :: setEMail (string newEMail)
{
EMail = newEMail;
}
void Personal_Details :: setPhoneNumber (int newPhoneNumber)
{
PhoneNumber = newPhoneNumber;
}
string Personal_Details :: getFirstName()
{
return FirstName;
}
string Personal_Details :: getLastName()
{
return LastName;
}
int Personal_Details :: getBirthdate()
{
return Birthdate;
}
string Personal_Details :: getEMail()
{
return EMail;
}
int Personal_Details :: getPhoneNumber()
{
if (PhoneNumber>12)
{
cout <<"INVALID. Program will now close.";
}
system ("PAUSE");
return PhoneNumber;
}
void Personal_Details :: QUESTIONS()
{
cout << "A.) Enter the following details:-" << endl <<endl;
cout << "First Name: ";
getline (cin, FirstName);
cout << endl;
cout << "Last (Family) Name: ";
getline (cin, LastName);
cout << endl;
cout << "Birthdate: ";
cin >> Birthdate;
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
cout << endl;
cout << "Email Address: ";
getline (cin, EMail);
cout << endl;
cout << "Phone Number: ";
cin >> PhoneNumber;
cout << endl;
cout<< FirstName <<" "<< LastName << endl
<<"Birthdate: "<< Birthdate << endl
<<"Email ID: "<< EMail << endl
<<"Phone Number: "<< PhoneNumber << endl;
}
int main()
{
Personal_Details NewContact;
cout << "- Add New Contact Information -" << endl << endl;
cout << "Note: Please type in only intergers (numbers) for 'Birthdate' and 'Phone Number' field. Also, phone number should be less than/or equal to 10 digits." << endl;
cout << "Else, this program will terminate abruptly." << endl << endl;
NewContact.QUESTIONS();
cout << endl << endl;
cout << "Press Any Key to Exit.";
cin.ignore();
cin.get();
return 0;
}
Please can you review and check why I am not able to input a real 10-digit phone number? I am new to C++, so I am unable to figure out a solution. Thanks for your help!

Answer 1

You are storing the phone number as an int, but the range of integers is –2,147,483,648 to 2,147,483,647; entering a 10 digit number outside of that range results in overflow and may be what is crashing your program.
You may want to read in the phone number as a string, check each character for validity, and process it however you need to (e.g.: a variable for area code, a variable of 7 digit number, reject out of range input and re-prompt).