/* Echoes a file, in reverse, to standard output */

#include <stdio.h>

#define   MAXSTRING   100

int main(void){
   char   filename[MAXSTRING];
   int    c;
   FILE   *ifp;

   // Prompt for file name:
   fprintf(stderr, "\nInput a filename:  ");
   scanf("%s", filename);

   // Read chars from file in reverse order:
   ifp = fopen(filename, "rb");    // MingW: b (for binary) seems necessary.
   fseek(ifp, 0, SEEK_END); 
   fseek(ifp, -1, SEEK_CUR);       // Now ready to read last char
   while (ftell(ifp) > 0) {        
      c = getc(ifp);        
      putchar(c);                  // Echo on standard output
      fseek(ifp, -2, SEEK_CUR);    
   }

   // The only character that has not been printed
   // is the very first character in the file. Handle it now:
   fseek(ifp, 0, SEEK_SET);
   c = getc(ifp);
   putchar(c); putchar('\n');

   // Close file:
   fclose(ifp);
   return 0;
}