Why is the last line printed twice? How can I fix the bug?

Question

#include<iostream>
#include<fstream>
#include<iomanip>

using namespace std;

class tele
{
private:
char name[20];
long long int num;
public:
void writeData();
void displayData();

};
void tele::writeData()
{
cout<<"Enter Name: "; cin>>name;
cout<<"Phone Number: "; cin>>num;
//cin.ignore();

}
void tele::displayData()
{
cout<<setiosflags(ios::right)<<setw(10)<<name<<setiosflags(ios::right)<<setw(10)<<num<<endl;

}

int main()
{
tele cus, nus;

ofstream file;
file.open("number.txt", ios::app);
cus.writeData();

file.write((char *)&cus, sizeof(cus));
file.close();

ifstream ifile;
ifile.open("number.txt", ios::ate);
ifile.seekg(0);
while(ifile){
ifile.read((char *)&nus, sizeof(nus));
nus.displayData();
}
}

Answer 1

Problem is with while(ifile). Don't you think it should be if(ifile).

while(ifile){
ifile.read((char *)&nus, sizeof(nus));
nus.displayData();
}