Thread: HELP: feof

heylo guys! im new here, just registered today!! yay!!!

ok im trying to write a program that takes an input file, reads its character by character and writes to a output file character by character.

now the problem is for example: input = 1 2 3 4 5, output = 1 2 3 4 5 4

and i really can't figure out why except maybe i dont know how to use feof...
here is the code, please help!!

Code:

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

int main(int argc, char* argv[])
{
	char* infile = argv[1];
	char* outfile = argv[2];

	FILE* inptr = fopen(infile, "r");
	FILE* outptr = fopen(outfile, "w");

	

	int data;
	while(!feof(inptr))
	{
		
		fread(&data, sizeof(int), 1, inptr);
		fwrite(&data, sizeof(int), 1, outptr);
	}
	
	fclose(inptr);
	fclose(outptr);
	return 0;
}

Do you zero your buffer in between write and read?

wow that fixed it! but really dont know why...??
but now the output file has a bunch of empty spaces at the end. u know why??

thanks

c-faq

Originally Posted by dlf723

wow that fixed it! but really dont know why...??
but now the output file has a bunch of empty spaces at the end. u know why??

thanks

Run through it in your head.
Read 1: Overwrite whole buffer with "1 2 "
R2: "3 4 "
R3: Overwrite first 2 bytes with "5 " leaving "5 4 "