Practical 15 OOP

 PRACTICAL – 15.1

Write a program to create files with constructor function, open function, and using various file mode parameters.

#include <iostream>

#include <conio.h>

#include <string.h>

#include <fstream>

#include <stdlib.h>

using namespace std;

int main()

{

    char fname[20];

    char rec[80], ch;

    cout << "Enter file name: ";

    cin.get(fname, 20);

    fstream fout(fname, ios::out);

    if (!fout)

    {

        cout << "Error in opening the file " << fname;

        getch();

        exit(1);

    }

    cin.get(ch);

    cout << "\nEnter a line to store in the file:\n";

    cin.get(rec, 80);

    fout << rec << "\n";

    cout << "\nThe entered line stored in the file successfully..!!";

    cout << "\nPress any key to see...\n";

    getch();

    fout.close();

    fstream fin(fname, ios::in);

    if (!fin)

    {

        cout << "Error in opening the file " << fname;

        cout << "\nPress any key to exit...";

        getch();

        exit(2);

    }

    cin.get(ch);

    fin.get(rec, 80);

    cout << "\nThe file contains:\n";

    cout << rec;

    cout << "\n\nPress any key to exit...\n";

    fin.close();

    getch();

    return 0;

}

PRACTICAL –  15.2

Write a program to use the following functions: Seekg(), Tellg(), Seekp(), Tellp(), Put(), Get(), Write(), Read()

#include <iostream>

#include <fstream>

#include <string>

using namespace std;

class jp

{

    int age;

    char *name = new char[100];

public:

    void ta_ipt()

    {

        cin.sync();

        cout << "Enter The Name: ";

        cin.get(name, 100, '\n'); //--------------->Use of get()

        cout << " " << endl;

        cout << "Enter The Age: ";

        cin >> age;

        cout << "Given name is: " << endl;

        while (*name != '\0')

        {

            cout.put(*name); ///---------------->Use of put()

            name++;

        }

    }

};

int main()

{

    fstream inOut("abc.txt",

                  fstream::ate | fstream::in | fstream::out);

    if (!inOut)

    {

        cerr << "Unable to open file!" << endl;

        return EXIT_FAILURE;

    }

    auto end_mark = inOut.tellg();

    inOut.seekg(0, fstream::beg);

    size_t cnt = 0;

    string line;

    while (inOut && inOut.tellg() != end_mark && getline(inOut, line))

    {

        cnt += line.size() + 1;

        auto mark = inOut.tellg();

        inOut.seekp(0, fstream::end);

        inOut << cnt;

        if (mark != end_mark)

            inOut << " ";

        inOut.seekg(mark);

    }

    inOut.seekp(0, fstream::end);

    inOut << "\n";

    // Writing

    jp ipt;

    fstream w_obj("abc.txt", ios::app | ios::binary | ios::in);

    w_obj.seekp(0, ios::end);

    ipt.ta_ipt();

    w_obj.write((char *)&ipt, sizeof(jp)); //------------->Use of Write() for writing for print computer readable binary characters in given textfile

    w_obj.read((char *)&ipt, sizeof(jp));  //------>Use of Read() for Assigning Address

    return 0;

}