Reverse File

reverse_file.c

#include <stdio.h>
#include <stdlib.h>

int main(int argc, const char * argv[]) {
    
    FILE *file;
    
    file = fopen("./oz.txt", "r+");
    if (file == NULL)
    {
        printf ("Error - Couldn't open file\n");
    }
    
    fseek(file, 0, SEEK_END); // move file pointer to end of file
    long size = ftell(file); // file pointer position == character count in file
    fseek(file, 0, SEEK_SET);  // move back to beginning of file
    
    char* buffer = (char*) malloc(size * sizeof(char));
    
    fread(buffer, sizeof(char), size, file); // read file contents to buffer
    
    for(long i = 0; i < size/2; ++i)
    {
        buffer[i] = buffer[size-i-1];
    }
    
    fseek(file, 0, SEEK_SET); // The fread set the file pointer to the end so we need to put it to the front again.
    
    fwrite(buffer, sizeof(char), size, file); // Write reverted content
    
    
    free(buffer);
    fclose(file);
    
    return 0;
}

It does not reverse all of the texts in your file, just half of them. Did u intend to do so?

Hey, this piece of 'c' code was written 5 years ago and I could remember what yo asked.

If you need full text then replace 22 for(long i = 0; i < size/2; ++i) to for(long i = 0; i < size; ++i)