Question

Developed as a console application without GUI, this student database system project

uses file to store the students’ information mentioned in the features below

Add Records

Search Records

Modify Records

Delete Records

Answer 1

#include <iostream>
#include <string>
#include <fstream>
#include <vector>


using namespace std;


class Student
{
public:
	Student(string name) { this->name = name;	}
	string GetName() { return name; }
	void SetName(string name) { this->name = name; }
private:
	string name;
};


int main()
{
	int choice = 0;
	string temp;
	while (true)
	{
		cout << "*****Menu*****" << endl;
		cout << "1. Add Record." << endl;
		cout << "2. Search Records." << endl;
		cout << "3. Modify Records." << endl;
		cout << "4. Delete Records." << endl;
		cout << "5. Exit." << endl;
		cout << "Enter your choice: ";
		cin >> choice;
		if (choice == 5) break;
		switch (choice)
		{
		case 1:
		{
			cout << "Enter name of student: ";
			cin >> temp;
			ofstream fout;
			fout.open("data.txt", ios::app);
			fout << endl << temp;
			fout.close();
			break;
		}
		case 2:
		{
			cout << "Enter student name which you want to find: ";
			cin >> temp;
			ifstream fin;
			fin.open("data.txt");
			string temp2;
			int count = 0;
			while (!fin.eof())
			{
				fin >> temp2;
				if (temp2 == temp) count++;
			}
			cout << "Find " << count << " Records in file" << endl;
			fin.close();
			break;
		}
		case 3:
		{
			ifstream fin;
			fin.open("data.txt");
			cout << "Enter which student you want to modify: ";
			cin >> temp;
			cout << "Enter new name: ";
			string temp3;
			cin >> temp3;
			string temp2;
			vector<string> Students;
			while (!fin.eof())
			{
				fin >> temp2;
				Students.push_back(temp2);
				if (Students[Students.size() - 1] == temp) Students[Students.size() - 1] = temp3;
			}
			fin.close();
			ofstream fout;
			fout.open("data.txt");
			for (int i = 0; i < Students.size(); i++)
			{
				if (i == Students.size() - 1)
				{
					fout << Students[i];
					break;
				}
				fout << Students[i] << endl;
			}
			break;
		}
		case 4:
		{
			ifstream fin;
			fin.open("data.txt");
			cout << "Enter which student you want to delete: ";
			cin >> temp;
			string temp2;
			vector<string> Students;
			while (!fin.eof())
			{
				fin >> temp2;
				if (temp2 != temp) Students.push_back(temp2);
			}
			fin.close();
			ofstream fout;
			fout.open("data.txt");
			for (int i = 0; i < Students.size(); i++)
			{
				if (i == Students.size() - 1)
				{
					fout << Students[i];
					break;
				}
				fout << Students[i] << endl;
			}
			break;
		}


		default:
			cout << "Wrong choice!" << endl;
			break;
		}
	}
	system("pause");
	return 0;
}