Opening and Closing a File in C in C++ Pdf

To open and close a file in C++ for reading and writing, you can use the fstream class, which provides file stream capabilities. Here’s how to open and close a file in C++ using fstream for both reading and writing, and then convert it to a PDF:

#include <iostream>
#include <fstream>
#include <string>

int main() {
    // Open a file for writing (or create if it doesn't exist)
    std::ofstream outFile("example.txt");

    if (!outFile.is_open()) {
        std::cerr << "Failed to open the file for writing." << std::endl;
        return 1;
    }

    // Write some data to the file
    outFile << "Hello, World!" << std::endl;
    outFile << "This is a test file." << std::endl;

    // Close the file
    outFile.close();

    // Open the same file for reading
    std::ifstream inFile("example.txt");

    if (!inFile.is_open()) {
        std::cerr << "Failed to open the file for reading." << std::endl;
        return 1;
    }

    // Read and display the contents of the file
    std::string line;
    while (std::getline(inFile, line)) {
        std::cout << line << std::endl;
    }

    // Close the file
    inFile.close();

    return 0;
}

In this example:

1. We first open a file named “example.txt” for writing using std::ofstream. If the file doesn’t exist, it will be created. If it fails to open, an error message is displayed.
2. We write some data to the file using the << operator.
3. We then close the file using the close method.
4. Next, we open the same file for reading using std::ifstream. Again, if it fails to open, an error message is displayed.
5. We read and display the contents of the file line by line using std::getline.
6. Finally, we close the file for reading.

To convert this text file into a PDF, you would typically need a library or tool designed for PDF generation, as a simple text file doesn’t have the formatting and structure necessary for a PDF document. Libraries like PDFlib or tools like LaTeX can be used to create PDF documents from text content, but they require additional setup and configuration.