Question

Hi,

I want to creat a file by the name osa_list that i can type 3 things and store there ( first name, last name, email). then i want to know how to recal them by modifying the code below. the names and contact information i want to store are 200.

#include <iostream>

#include <fstream>

#include <cstdlib>

#include <iomanip>

using namespace std;

class Student

{

private:

string fname;

string lname;

string email;

  

  

public:

Student();

Student(string fname, string lname, string email);

string getfname() const

{

return fname;

}

string getlname() const

{

return lname;

}

  

string getemail() const

{

return email;

}

  

void setfname(string fname)

{

this->fname = fname;

}

void setlname(string lname)

{

this->lname= lname;

}

void setemail(string email)

{

this->email = email;

}

friend void Sort(Student studentlist[], int size);

friend ostream& operator<<(ostream &, Student slist[]);

};

Student::Student()

{

fname = "";

lname = "";

email = "";

}

Student::Student( string fname, string lname, string email)

{

this->fname = fname;

this->lname = lname;

this->email = email;

}

void Sort(Student studentlist[], int size)

{

for (int i = 0; i < size - 1; i++)

{

for (int j = 0; j < size - i - 1; j++)

{

  

Student temp = studentlist[j];

studentlist[j] = studentlist[j + 1];

studentlist[j + 1] = temp;

  

}

}

}

ostream& operator<<(ostream &output, Student slist)

{

output << slist.getfname() << " ";

output << slist.getlname() << " ";

output << slist.getemail();

output << endl;

return output;

}

int main()

{

Student studentlist[200];

string fname, lname, email;

int size = 0;

  

ifstream input;

input.open("input.dat");

  

if (input.fail())

{

cout << "Error: file not found!" << endl;

exit (1);

}

  

else

{

while (input >> fname >> lname >> email)

{

  

studentlist[size]= Student(fname, lname, email);

size++;

}

}

  

Sort(studentlist, size);

  

ofstream output;

output.open("output.dat");

  

if (output.fail())

{

cout << "Error: file not found!" << endl;

exit(1);

}

  

for (int i = 0; i < size; i++)

{

output << studentlist[i];

}

  

input.close();

output.close();

  

cout << "Your file is ready and has been transferred...." << endl;

  

return 0;

}

Answer 1

If you have any doubts, please give me comment...

#include <iostream>

#include <fstream>

#include <cstdlib>

#include <iomanip>

using namespace std;

class Student

{

private:

string fname;

string lname;

string email;

public:

Student();

Student(string fname, string lname, string email);

string getfname() const

{

return fname;

}

string getlname() const

{

return lname;

}

string getemail() const

{

return email;

}

void setfname(string fname)

{

this->fname = fname;

}

void setlname(string lname)

{

this->lname = lname;

}

void setemail(string email)

{

this->email = email;

}

friend void Sort(Student studentlist[], int size);

friend ostream &operator<<(ostream &, Student slist[]);

};

Student::Student()

{

fname = "";

lname = "";

email = "";

}

Student::Student(string fname, string lname, string email)

{

this->fname = fname;

this->lname = lname;

this->email = email;

}

void Sort(Student studentlist[], int size)

{

for (int i = 0; i < size - 1; i++)

{

for (int j = 0; j < size - i - 1; j++)

{

Student temp = studentlist[j];

studentlist[j] = studentlist[j + 1];

studentlist[j + 1] = temp;

}

}

}

ostream &operator<<(ostream &output, Student slist)

{

output << slist.getfname() << " ";

output << slist.getlname() << " ";

output << slist.getemail();

output << endl;

return output;

}

int main()

{

Student studentlist[200];

string fname, lname, email;

int size = 0;

ifstream input;

input.open("input.dat");

if (input.fail())

{

cout << "Error: file not found!" << endl;

exit(1);

}

else

{

while (input >> fname >> lname >> email)

{

studentlist[size] = Student(fname, lname, email);

size++;

}

}

Sort(studentlist, size);

ofstream output;

output.open("output.dat");

if (output.fail())

{

cout << "Error: file not found!" << endl;

exit(1);

}

for (int i = 0; i < size; i++)

{

output << studentlist[i].getfname()<<" "<<studentlist[i].getlname()<<" "<<studentlist[i].getemail();

}

input.close();

output.close();

cout << "Your file is ready and has been transferred...." << endl;

return 0;

}