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Full Discussion: How to calculate compilation time using c?
Top Forums Programming How to calculate compilation time using c? Post 302742205 by Corona688 on Monday 10th of December 2012 06:56:52 PM
Old 12-10-2012
%i and %d mean integer, float or double would be %f.

I usually use this code:

Code:
#include <sys/time.h>
#include <sys/types.h>
#include <stdio.h>

/* returns a timestamp in microseconds */
int64_t micro(void)
{
	int64_t val;
	struct timeval tv;
	gettimeofday(&tv, NULL);
	val=tv.tv_sec;
	val*=1000000;
	val+=tv.tv_usec;
	return(val);
}

This User Gave Thanks to Corona688 For This Post:
niterobin
 

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LEARN ABOUT CENTOS

difftime

DIFFTIME(3)						     Linux Programmer's Manual						       DIFFTIME(3)

NAME

       difftime - calculate time difference

SYNOPSIS

       #include <time.h>

       double difftime(time_t time1, time_t time0);

DESCRIPTION

       The  difftime()	function  returns  the	number of seconds elapsed between time time1 and time time0, represented as a double.  Each of the
       times is specified in calendar time, which means its value is a measurement (in seconds) relative to the Epoch, 1970-01-01  00:00:00  +0000
       (UTC).

CONFORMING TO

       SVr4, 4.3BSD, C89, C99.

NOTES

       On a POSIX system, time_t is an arithmetic type, and one could just define

	      #define difftime(t1,t0) (double)(t1 - t0)

       when the possible overflow in the subtraction is not a concern.

SEE ALSO

       date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)

COLOPHON

       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2012-12-22							       DIFFTIME(3)
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