File path in C++

In C++, to get the file path, you can use various methods such as:

1. Using the __FILE__ macro:

This macro returns the full path of the current source file. You can use it to get the location of the source file and append the desired filename to it to get the complete file path. Here is an example:

#include 
#include 
using namespace std;
int main() {

   // Get the current source file path

   string currentFilePath = __FILE__;
// Append the desired filename to get the complete file path

   string desiredFilePath = currentFilePath.substr(0, currentFilePath.find_last_of("\\/"))

                             + "/myfile.txt";
// Print the complete file path

   cout << desiredFilePath << endl;
return 0;

}

In this example, we first get the current source file path using the __FILE__ macro. We then use the substr() and find_last_of() functions to extract the directory part of the path and append the desired filename to it.

2. Using the filesystem library:

C++17 introduced a new standard library called std::filesystem that provides many functions for file-system operations. You can use the std::filesystem::current_path() function to get the current directory and use the std::filesystem::path() function to create file paths. Here is an example:

#include 
#include 
#include 
using namespace std;
namespace fs = std::filesystem;
int main() {

   // Get the current directory

   fs::path currentDir = fs::current_path();
// Create the complete file path

   fs::path filePath = currentDir / "myfile.txt";
// Print the complete file path

   cout << filePath << endl;
return 0;

}

In this example, we use the fs::current_path() function to get the current directory and the fs::path() function to create the complete file path by concatenating the directory and filename.

Note: The std::filesystem library is not supported by all compilers and operating systems yet. You may have to use a different approach in those cases.