Home » C++ programs » C++ file handling programs

C++ program to write and read object using read and write function

In this program, we will write and read values through object in/from text files. Here you will learn how to write object value in file and how to access them.

Write and read object values in the file using read and write function

//C++ program to write and read object using read and write function.
#include <iostream>
#include <fstream>
 
using namespace std;
 
//class student to read and write student details
class student
{
    private:
        char name[30];
        int age;
    public:
        void getData(void)
        { cout<<"Enter name:"; cin.getline(name,30);
          cout<<"Enter age:"; cin>>age;
        }
 
        void showData(void)
        {
        cout<<"Name:"<<name<<",Age:"<<age<<endl;
        }
};
 
int main()
{
    student s;
     
    ofstream file;
 
    //open file in write mode
    file.open("aaa.txt",ios::out);
    if(!file)
    {
      cout<<"Error in creating file.."<<endl;
      return 0;
    }
    cout<<"\nFile created successfully."<<endl;
 
    //write into file
    s.getData();    //read from user
    file.write((char*)&s,sizeof(s));    //write into file
 
    file.close();   //close the file
    cout<<"\nFile saved and closed succesfully."<<endl;
 
    //re open file in input mode and read data
    //open file1
    ifstream file1;
    //again open file in read mode
    file1.open("aaa.txt",ios::in);
    if(!file1){
        cout<<"Error in opening file..";
        return 0;
    }
    //read data from file
    file1.read((char*)&s,sizeof(s));
 
    //display data on monitor
    s.showData();
    //close the file
    file1.close();
     
    return 0;
}

Output

File created successfully.
Enter name:Mike
Enter age:21

File saved and closed succesfully.
Name:Mike,Age:21