Thread: Reversing word in a file

Hi all,

I am really stuck with this problem, I need help ,ideas......I am reading data from a file and outputing it to another file in a reverse mode. my problem is how to reverse each word ....

sorry ....I forgot to post what i have done so far !!!

Code:

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

int main(int argc , char **argv[ ] ) {
    char ch;
    FILE *input_file = fopen(argv[1], "r");
    if (!input_file) {
        printf("Please create a file named \"input.txt\""
               " in the working directory.\n");
        return EXIT_FAILURE;
    }
    FILE *output_file = fopen ("output.txt", "w");
    
    fseek ( input_file , 0L , SEEK_END );
    long pos = ftell ( input_file );

    pos = pos - 1;
    while ( pos >= 0L ) {
        fseek ( input_file , pos , SEEK_SET );
        ch = fgetc( input_file );
        if ( ch==' ' ){
            fputc('\n', output_file);
        }
        else
            fputc ( ch, output_file );
        
        pos-- ;

    }
    fclose(input_file);
    fclose(output_file);
    
    return EXIT_SUCCESS;
}

This is reading the data from input and outputing it to output but my problem here is my code is reversing every characters instead of word.....

Thats why I am here ...I need idea what to do next ...

No reversing words not character .....

input: HELLO MY NAME
output: EMAN YM OLLEH

The output should be : NAME MY HELLO

I understand I have to stop reading a word after i see '\n' but I am confused going from the beginning of the word to the end and copying the word!!

I thought I will get ideas here ,well its unfortunate !!

Ok... to give you some starting direction...

Think about loading the entire file into memory then scanning it in memory, in reverse, counting the lenth of each word (a group of characters separated by whitespace) and then writing the file out in chunks of one word...

Shouldn't be all that hard to figure out from there...