@node clock, time
@subheading Syntax

@example
#include <time.h>

clock_t clock(void);
@end example

@subheading Description

This function returns the number of clock ticks since an arbitrary time,
actually, since the first call to @code{clock}, which itself returns
zero.  The number of tics per second is CLOCKS_PER_SEC.

@subheading Return Value

The number of tics.

@subheading Portability

@portability ansi, posix

@subheading Example

@example
printf("%d seconds have elapsed\n", clock()/CLOCKS_PER_SEC);
@end example