ahmed filesc++

/*the fstream library allows us to work with files.
To use The fstream library,include both the standard:
<iostream>AND the <fstream> header file:
Example:
#include<iostream>
#include<fstream>
there are three classes included in the fstream Library.
Which are used to Create,Write or read file:
ofstream:Create and Writes to files.
ifstream:Reads from files.
fstream:A Combination of ofstream and ifstream:creates,reads,and writeto files.*/
/*******************************************************************************/
//Create and Write To File.
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
	//Create and open a text file.
	ofstream Myahmedfile("ahmedfile.txt");
	//Write to the file.
	Myahmedfile << "Hello Ahmed Abdelmoneim";
	//Close the file.
	Myahmedfile.close();
}

//Read from the file.
#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main()
{
	//Create a text file.
	ofstream Mywritefile("fileAhmed.txt");
	//Write to the file.
	Mywritefile << "Ahmed abdelmoneim!";
	//Close the file.
	Mywritefile.close();
	//Create a text string,
	string myText;
	//read from the text
	ifstream Myreadfile("fileAhmed.txt");
	while (getline(Myreadfile, myText))
	{
		cout << myText;
	}
	Myreadfile.close();
};

//Read from the file.
#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main()
{
	//Create a text file.
	ofstream Mywritefile("fileAhmed.txt");
	//Write to the file.
	Mywritefile << "Ahmed abdelmoneim!\nmohamed";
	//Close the file.
	Mywritefile.close();
	//Create a text string,
	string myText;
	//read from the text
	ifstream Myreadfile("fileAhmed.txt");

	while (getline(Myreadfile, myText))
	{

		cout << myText;
	}
	
	Myreadfile.close();
};

#include<iostream>
#include<fstream>
using namespace std;
int main()
{
	ofstream outfile("grades.txt", ios::out);
	if (!outfile)
	{
		cerr << "error:output file cannot be opened\n";
		exit(1);
	}
	char id[9], name[16];
	int grade;
	cout << "\t:";
	int n = 1;
	while (cin>>id>>name>>grade)
	{
		outfile << name << " " << id << " " << grade << endl;
		cout << "\t" << ++n << ":";
	}
	outfile.close();

}

ios::in allows input (read operations) from a stream.
ios::out allows output (write operations) to a stream.
| (bitwise OR operator) is used to combine the two ios flags,
meaning that passing ios::in | ios::out to the constructor
of std::fstream enables both input and output for the stream.
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
	ofstream outfile("grades.txt", ios::out);//ios::out Write operations.
	if (!outfile)
	{
		cerr << "error:output file cannot be opened\n";
		exit(1);
	}
	char id[9], name[16];
	int grade;
	cout << "\t:";
	int n = 1;
	while (cin>>id>>name>>grade)
	{
		outfile << name << " " << id << " " << grade << endl;
		cout << "\t" << ++n << ":";
	}
	outfile.close();

}

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main()
{
	/*ofstream outfile("grade.txt", ios::out);
	if (!outfile)
	{
		cerr << "error:output file cannot be opened\n";
		exit(1);
	}
	char id[9], name[16];
	int grade;
	cout << "\t1:";
	int n = 1;
	while (cin>>id>>name>>grade)
	{
		if (n==3)
		{
			break;

		}
		outfile << name << " " << id << " " << grade << endl;
		cout << "\t" << ++n << ":";
	}
	outfile.close();*/
	ifstream infile("grade.txt", ios::in);
	if (!infile)
	{
		cerr << "error:input file cannot be opened.\n";
		exit(1);
	}
	char id[9], name[16];
	int grade, sum = 0, count = 0;
	while (infile>>id>>name>>grade)
	{
		sum += grade;
		++count;
	}
	infile.close();
	cout << "the grade average is:" << float(sum) / count << endl;
}

#include<iostream>
using namespace std;
const int Max = 100;
int buff[Max];
int main()
{
	for (int i = 0; i < Max; i++)
	{
		buff[i] = i;
	}
	ofstream os("edata.txt", ios::binary);
	os.write((char*)buff, Max * sizeof(int));
	os.close();
	for (int i = 0; i < Max; i++)
	{
		buff[i] = 0;
	}
	ifstream is("edata.txt", ios::binary);
	is.read((char*)buff, Max * sizeof(int));
	for (int i = 0; i < Max; i++)
	{
		if (buff[i]!=i)
		{
			cerr << "\ndata is incorrect";
			return 0;
		}
		else
		{
			cout << "\ndata is correct";
		}
	}
}

//binary input and output with integer.
//we use two functions:write()andread().
//they transfer a buffer full of bytes to and from a disk file.
//the parameters to write() and read() are the buffer address.
//and its length.
#include<fstream>

#include<iostream>
#include<fstream>
using namespace std;
class employeefile {
private:
	char employee[20];
	char worktype[20];
	int age;
public:
	void getdata(void)
	{
		cout << "Enter employee name:"; cin >>employee;
		cout << "Enter work type:"; cin >> worktype;
		cout << "Enter age:"; cin >> age;
	}
	void showdata(void)
	{
		cout << "\n employee name:"<<employee<<endl;
		cout << "\n work type:" << worktype << endl;
		cout << "\n age:" << age << endl;
	}

};
int main()
{
	employeefile E;
	E.getdata();
	ofstream creatfile("employee.txt", ios::binary);
	creatfile.write((char*)&E, sizeof(E));
	creatfile.close();
	ifstream infine("employee.txt", ios::binary);
	infine.read((char*)&E, sizeof(E));
	E.showdata();
	infine.close();
}

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
class employeefile {
private:
	char employee[20];
	char worktype[20];
	int age;
public:
	void getdata(void)
	{
		cout << "Enter employee name:"; cin >>employee;
		cout << "Enter work type:"; cin >> worktype;
		cout << "Enter age:"; cin >> age;
	}
	void showdata(void)
	{
		cout << "\n employee name:"<<employee<<endl;
		cout << "\n work type:" << worktype << endl;
		cout << "\n age:" << age << endl;
	}

};
int main()
{
	employeefile E;
	E.getdata();
	ofstream creatfile("employee.txt" /*ios::binary*/);
	creatfile.write((char*)&E, sizeof(E));
	creatfile.close();
	ifstream infine("employee.txt" /*ios::binary*/);
	infine.read((char*)&E, sizeof(E));
	E.showdata();
	infine.close();
	return 0;
};

#include <bits/stdc++.h>
using namespace std;

/* class definition for each record */
class Employee{
    
    int id;
    string name;
    
    public:

    Employee(int Id, string Name){
        id = Id;
        name = Name;
    }

    int getid(){
        return id;
    }

    void print(){
        cout<<"Id : "<<id<<"\n";
        cout<<"Name : "<<name<<"\n";
    }

};

/* class definition which stores multiple records of 'Employee' type */
class EmployeeFile
{
    
    vector<Employee> file;

	public:

    void add(int id, string name){
        file.push_back(Employee(id,name));
    }

    Employee search(int id){
        for(auto f : file){
            if(f.getid() == id)
                return f;
        }
        return {0,""};
    }

    void print(){
        for(auto f : file){
            f.print();
        }
    }

};

int main() {
	
    EmployeeFile emp;

    /* input number of records */
    int n;
    cin>>n;

    for(int i=0;i<n;i++){
        int id;
        string name;
        cin>>id>>name;
        /* add record */
        emp.add(id,name);
    }

    cout<<"List of employees\n";
    /* print records */
    emp.print();

    int key;
    cin>>key;

    /* search record with key */
    Employee e = emp.search(key);

    cout<<"Searched employee\n";
    e.print();
    
	return 0;
}

#include<iostream>
#include<fstream>
using namespace std;

class Bank_Customer
{
protected:
	char name[40];
	int age;
	int balance;
	char gender;
	char phone[15];
	char address[50];
public:
	void getdata(void) {
		cout << "Enter name:"; cin >> name;
		cout << "Enter age:"; cin >> age;
		cout << "Enter balance:"; cin >> balance;
		cout << "Enter gender(m/f):"; cin >> gender;
		cout << "Enter phone number:"; cin >> phone;
		cout << "Enter Address:"; cin >> address;
	}
	void showdata(void) {
		cout << "\nName:" << name;
		cout << "\nAge:" << age;
		cout << "\nBalance:" << balance;
		cout << "\nGender:" << gender;
		cout << "\nPhone number:" << phone;
		cout << "\nAddress:" << address;
		cout << endl;
	}
	void CreateFile(void){
		fstream file;
		file.open("Customer.txt", ios::app | ios::out | ios::binary);
		if (!file) {
			cerr << "error:input file cannot be opened.\n";
			exit(1);
		}
		else if(file)
		{
			cout << "file already exists and ready for input";
		}
		else
		{
			cout << "File Created Successfuly" << endl << endl;
		}
		file.close();
		
	}
	void AddRecord() {
		ofstream outfile;
		outfile.open("Customer.txt", ios::app | ios::out | ios::binary);
		Bank_Customer c;
		char choice;
		do {
			cout << "\nEnter person's data:" << endl;
			c.getdata();
			outfile.write((char*)&c, sizeof(c));
			cout << "do you want to add another record?(y/n):";
			cin >> choice;

		} while (choice=='y');
		outfile.close();
	}
	void DisplayAllRecords() {
		Bank_Customer cc;
		fstream file;
		file.open("Customer.txt", ios::in | ios::binary);
		if (!file)
		{
			cerr << "Error:input file cannot be openend\n";
			exit(1);
		}
		file.seekg(0);
		file.read((char*)&cc, sizeof(cc));
		while (!file.eof())
		{
			cout << "\nCustomer:";
			cc.showdata();
			file.read((char*)&cc, sizeof(cc));
		}
		cout << endl;
	}
};
int main(void)
{
	cout << "_____Welcome_to__Bank_System_____" << endl;
	cout << "Choose_from_list:" << endl;
	cout << "1-Create-file" << endl;
	cout << "2-Add-record(add customer)" << endl;
	cout << "3-Display all records(Display all customers)" << endl;
	cout << "4-Exit" << endl;
	int ans;
	cin >> ans;
	Bank_Customer cust;
	switch (ans)
	{
	case 1:
		cust.CreateFile();
		cust.AddRecord();
		break;
	case 2:
		cust.AddRecord();
		break;
	case 3:
		cust.DisplayAllRecords();
		break;
	case 4:
		exit(1);
	default:
		cout << "Error";
		exit(1);
		break;
	}
	system("pause");
}