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

We will discuss about four file hacks listed as below-

Rename – Rename a file using C/C++
Remove – Remove a file using C/C++
File Size – Get the file size using C/C++
Check existence – Check whether a file exists or not in C/C++

// A 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<stdio.h> 
#include<stdlib.h> 
#include<stdbool.h> 
  
// 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() 
{ 
    printf("%llu Bytes\n", fileSize("Passwords.txt")); 
    printf("%llu Bytes\n", fileSize("Notes.docx")); 
  
    if (fileExists("OldData.txt") == true ) 
        printf("The File exists\n"); 
    else
        printf("The File doen't exist\n"); 
  
    rename("Videos", "English_Videos"); 
    rename("Songs", "English_Songs"); 
  
    remove("OldData.txt"); 
    remove("Notes.docx"); 
  
    if (fileExists("OldData.txt") == true ) 
        printf("The File exists\n"); 
    else
        printf("The File doesn't exist\n"); 
  
    return 0; 
} 

Output:

Screenshot before executing the program :

Screenshot after executing the program :

This article is contributed by Rachit Belwariar. If you like GeeksforGeeks and would like to contribute, you can also write an article and mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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