it generates weird file length

[nerio]

Hi. I wrote a program that should make a file of pseudo random numbers. It should have a length of 1MB, because n=1'000'000.

The program works, but the resulting file have actually length of 1'003'904. Why doesn't the file have a length of 1'000'000 exactly?

Here is the source code:

/* this program is a pseudo random generator using function rand() */
#include<stdio.h>
#include<math.h> 
main()
{
FILE *f1;
long int n,i;
int z;

printf("Processing..\n\n");
f1=fopen("output.out","w"); /*Open the file Input*/

n=1000000;

for(i=1;i<=n;i++){
z=rand() % 256;
putc(z,f1); /*write a character to input*/
}

fclose(f1); /*close the file input*/
printf("Done.");
getch();
}

Thank you for help.

[tabstop]

Are you on windows? If so, every time you intend to write 0x0A, it will write 0x0D 0x0A instead (I might have the A and D switched), unless you write the file in binary mode.

[nerio]

Yes I use Windows 7, 64 bit.

So I guess I have to learn how to make a binary file. Thank you.

[tabstop]

Yes I use Windows 7, 64 bit.

So I guess I have to learn how to make a binary file. Thank you.

It's exactly as easy as making a text file as you are doing. (You should read what fopen does.)

[AndrewHunter]

Yes I use Windows 7, 64 bit.
So I guess I have to learn how to make a binary file. Thank you.

Hmm.....How do I work with files?

The layout of this site is so obfuscated.