Sequential Input and Output Operations in C++

 Sequential Input and Output Operations in C++

Sequential input and output operations in C++ involve processing data in a file in the order in which it is stored. These operations are straightforward and suited for applications where the data is read or written linearly.

C++ provides classes and functions for sequential I/O through the <fstream> library. The most commonly used classes are:

• ifstream: For input (reading data from files).
• ofstream: For output (writing data to files).
• fstream: For both input and output operations.

Basic Workflow of Sequential I/O

1. Input Operations:

   • Open a file for reading using ifstream.
   • Read data sequentially until the end of the file.
   • Close the file after reading.

2. Output Operations:

   • Open a file for writing using ofstream.
   • Write data sequentially to the file.
   • Close the file after writing.
     
     

Example: Sequential Output Operation

Writing data sequentially to a file.

Example: Sequential Input Operation

Reading data sequentially from a file.

Program:

#include <iostream>

#include <fstream>

#include <string>

using namespace std;

int main() {

    ifstream infile("example.txt");

    if (!infile) {

        cout << "Error opening file for reading!" << endl;

        return 1;

    }

    string line;

    // Sequentially reading data from the file

    while (getline(infile, line)) {

        cout << line << endl; // Print each line

    }

    infile.close();

    return 0;

}