Four File Handling Hacks which every C/C++ Programmer should know

// C++ Program to demonstrate the
// four file hacks every C/C++ must know

// Note that we are assuming that the files
// are present in the same file as the program
// before doing the below four hacks

#include <iostream>
#include <stdlib.h>
using namespace std;

// A Function to get the file size
unsigned long long int fileSize(const char *filename)
{
    // Open the file
    FILE *fh = fopen(filename, "rb");
    fseek(fh, 0, SEEK_END);
    unsigned long long int size = ftell(fh);
    fclose(fh);

    return size;
}

// A Function to check if the file exists or not
bool fileExists(const char * fname)
{
    FILE *file;
    if (file = fopen(fname, "r"))
    {
        fclose(file);
        return true;
    }
    return false;
}

// Driver Program to test above functions
int main()
{
    cout << fileSize("Passwords.txt") << " Bytes\n";
    cout << fileSize("Notes.docx") << " Bytes\n";

    if (fileExists("OldData.txt") == true )
        cout << "The File exists\n";
    else
        cout << "The File doesn't exist\n";

    rename("Videos", "English_Videos");
    rename("Songs", "English_Songs");

    remove("OldData.txt");
    remove("Notes.docx");

    if (fileExists("OldData.txt") == true )
        cout << "The File exists\n";
    else
        cout << "The File doesn't exist\n";

    return 0;
}

// This code is contributed by sarajadhav12052009