How do you truncate a file?

[dan debrunner]

In article <1991May6.194614.9641 at pensoft.uucp> lwb at pensoft.uucp (Lance Bledsoe) writes:
>In article <f25g_zd at rpi.edu> fitz at mml0.meche.rpi.edu (Brian Fitzgerald) writes:
>>Rudi Cilibrasi writes:
 >>>Suppose I have a 100-byte file called "myfile.dat", and I want to get
 >>>rid of the last 10 bytes.
 >>
 >>#include <stdio.h>
 >>main () {
 >>int	i;
 >>for (i=0; i < 90 ; i++) {
 >>		(void) putchar(getchar());
 >
 >Do you think you could have thought of a *slower* way to do this???

Actually a correct way would have been even better. Remember putchar()
is a macro on many platforms which evaluates its argument twice.

Dan.