Better, Simpler, Flip-Flop "encryption"

/*
Backwerdz version 1.00 by Miah.
It takes a file, reads it from back to front, 
and outputs it to a new backwards file that
can't be read normally.
Simple enough...
On with the code!
*/
#include <stdio.h>

main()
{
	char fileIn[30], fileOut[30];
	char byteBuff[1];
	int x=-1, Fsize;
	printf("\t\t\tMiah's Backwerdz file encoder\n");
	printf("\n\nEnter Filename to Encode/Decode: ");
		scanf("%s",fileIn);
	printf("\nEnter name to output file as: ");
		scanf("%s",fileOut);
FILE *in, *out;
	
	in = fopen(fileIn, "rb");     //Need that "b" so it can read binary too!
             
	out = fopen(fileOut, "wb");     //And write it..

fseek(in, 0, SEEK_END);
Fsize = ftell(in);      //This fTells us the size of the file by going to the end
               // and reading what the number of the last byte is
	

fseek(in, -1, SEEK_END);       //We seek a negative one (-1) from our position at the 
									 //end of the file so we read it backwards
do
{ 
	
fseek(in, x, SEEK_END);       
	fread(&byteBuff,1,1,in);     //read and write at the same time 
	fwrite(&byteBuff,1,1,out);

x--;                 //Continue to countdown
Fsize--;               //Decrease size count so we can 
}while(Fsize > 0);         //Break the loop when it reaches zero
fclose(in);           //Close It!
fclose(out);
return 0;
}