Answer to Question #174680 in C++ for zain ul abdeen

Question

Similar to previous, make Student class with 4 data members (name, roll no, GPA, credit hours) and 2 constructors (one user input, one file input) and a destructor.

Answer 1

#include <iostream>
#include <fstream>
#include <string>
 
using namespace std;
 
class Student
{
public:
	Student(string file);
	Student();
	~Student();
	void Display();
private:
	string name;
	int rollNo;
	double GPA;
	int creditHours;
};
 
Student::Student()
{
	cout << "User input constructor!" << endl;
	cout << "Student name: ";
	cin >> name;
	cout << "Student roll no: ";
	cin >> rollNo;
	cout << "Student GPA: ";
	cin >> GPA;
	cout << "Student credit hours: ";
	cin >> creditHours;
	cout << "All data was entered new object Student successfully created!" << endl;
}
 
Student::Student(string file)
{
	cout << "File input constructor!" << endl;
	fstream in;
	in.open(file);
	if (!in)
	{
		cout << "There is no file with such name." << endl;
		name = "";
		rollNo = 0;
		GPA = 0;
		creditHours = 0;
		return;
	}
	in >> name >> rollNo >> GPA >> creditHours;
	cout << "New Student object was successfully created using data from file." << endl;
}
 
Student::~Student()
{
	cout << "Student which name was " << name << " successfully destroyed!" << endl;
}
 
void Student::Display()
{
	cout << "*****Student Information******" << endl;
	cout << "Student name: " << name << endl;
	cout << "Student roll no: " << rollNo << endl;
	cout << "Student GPA: " << GPA << endl;
	cout << "Student credit hours: " << creditHours << endl;
	cout << "******************************" << endl;
}
 
int main()
{
	Student User;
	cout << endl;
	User.Display();
	cout << endl;
	string fileName;
	cout << "Enter file's name with Student data: ";
	cin >> fileName;
	Student studentFromFile(fileName);
	studentFromFile.Display();
	cout << endl;
	return 0;
}