C++ program for store student detail in a file | File handling

C++ program for store student detail in a file:-

In this post i am going to write a C++ program that illustrate the use of file handling in C++. File handling requires when we want to save data for in future, if the data require then we  can easily get them. Since, the life of a variables which we make in a program less than the life of the program. As soon as the program end the variables also vanished.

The following program construct a structure student containing the field for Roll no., Name, Class, Year and total marks.
          

Let's begin the program:- 

#include <iostream>

#include <fstream>

using namespace std;

struct student

{

int RollNo;

char Name[30];

int year;

char class1[30];

float total_marks;

};

void ReadStudent(student & TempStud)

{

cout << "\n Enter roll no.: ";

cin >> TempStud.RollNo;

cin.clear();

fflush(stdin);

cout << "\n Enter name: ";

cin.getline(TempStud.Name,30);

cout << "\n Enter class: ";

cin.clear();

fflush(stdin);

cin.getline(TempStud.class1,30);

cout << "\n Enter year";

cin>>TempStud.year;

cin.clear();

fflush(stdin);

cout<< "\n Enter total marks :";

cin>>TempStud.total_marks;

}

void WriteStudent(student TempStud)

{

cout << "\n The roll no.: ";

cout << TempStud.RollNo;

cout << "\n The name: ";
 cout<< TempStud.Name;

cout << "\n Class: ";

cout << TempStud.class1;

cout << "\n Year : ";

cout<< TempStud.year;

cout<< "\n Total marks: ";

cout<< TempStud.total_marks;

}
int main()

{

cout<<"\n 1. Enter data:";

cout<<"\n 2. Display data:";

cout<<"\n Enter your choice:";

short i;

cin>>i;

switch(i){

case 1:

{

struct student Student_Out;

ofstream StudFile_Out;

StudFile_Out.open("student.dat", ios::out | ios::binary | ios::trunc);

if(!StudFile_Out.is_open())

cout << "File cannot be opened \n";

char Continue = 'y';

do

{

ReadStudent(Student_Out);

StudFile_Out.write((char*) &Student_Out, sizeof(struct student));

if(StudFile_Out.fail())

cout << "File write failed";

cout << "Do you want to continue? (y/n): ";

cin >> Continue;

} while(Continue != 'n');

StudFile_Out.close();

break;

}

case 2:

{

struct student Student_In;

ifstream StudFile_In("student.dat", ios::in | ios::binary);

while(!StudFile_In.eof())

{

StudFile_In.read((char*) &Student_In, sizeof(struct student));

if(StudFile_In.fail())

break;

WriteStudent(Student_In);

}

StudFile_In.close();

break;

}

default:

cout<<"\n Invalid :";

main();

}

return 0;

}

Output:-

When user choice is 1:

When user choice is 2: