Print from center of file

Write a program that opens a file named example.txt, moves the file position marker to the middle of the file using the seekg() function, and reads and prints the remaining content of the file from that point onward.

Hint

You can get the size of the file by moving the position marker to the end (seekg(0, std::ios::end)) and getting the position (tellg()).
You can store position markers in std::streampos.

Answer

#include <iostream>
#include <fstream>

int main() {
    std::ifstream inFile("example.txt", std::ios::in | std::ios::binary);
  
    if (!inFile) {
        std::cerr << "Error: Could not open the file example.txt." << std::endl;
        return 1;
    }

    // Calculate the file size
    inFile.seekg(0, std::ios::end);
    std::streampos fileSize = inFile.tellg();

    // Calculate the middle position
    std::streampos middlePos = fileSize / 2;

    // Move the file position marker to the middle
    inFile.seekg(middlePos, std::ios::beg);

    // Read and print the rest of the file
    std::string line;
    std::cout << "Reading from the middle of the file:" << std::endl;
    while (std::getline(inFile, line)) {
        std::cout << line << std::endl;
    }

    inFile.close();
    return 0;
}

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