C++17 File Open

main.cpp

// Requires at least C++17
#include <filesystem>
#include <fstream>
#include <iostream>
#include <string>

int main() {
	
	// Path is relative to executable.
    std::filesystem::path filePath = "./out.txt";

    if (std::filesystem::exists(filePath)) {
        std::cout << "File already exists!" << std::endl;
        
        std::ifstream inFile;
        inFile.open(filePath);
        
        if (inFile.is_open()) {
        	std::cout << "Here are the contents of the file:" << std::endl;
        	
        	for (std::string buffer; std::getline(inFile, buffer); std::cout << buffer);
        	
        } else {
		std::cerr << "Unable to open file!\n";
		return 1;
	}
    } else {
    	std::cout << "File does not exist!\nCreating it now..." << std::endl;
	
	std::ofstream outFile;
	outFile.open(filePath, std::ios::trunc);

	if (outFile.is_open()) {
		outFile << "Hello, World!" << std::endl;
	} else {
		std::cerr << "Unable to open file!\n";
		return 1;
	}
	outFile.close();
	std::cout << "Wrote to file." << std::endl;
    }
    return 0;
}