time.cpp

#include <iostream>
#include <time.h>
using namespace std;
 
timespec diff(timespec start, timespec end);
 
int main()
{
	timespec time1, time2;
	int temp;
	clock_gettime(CLOCK_REALTIME, &time1);
	for (int i = 0; i< 242000000; i++)
		temp+=temp;
	clock_gettime(CLOCK_REALTIME, &time2);
	cout<<diff(time1,time2).tv_sec<<":"<<diff(time1,time2).tv_nsec<<endl;
	return 0;
}
 
timespec diff(timespec start, timespec end)
{
	timespec temp;
	if ((end.tv_nsec-start.tv_nsec)<0) {
		temp.tv_sec = end.tv_sec-start.tv_sec-1;
		temp.tv_nsec = 1000000000+end.tv_nsec-start.tv_nsec;
	} else {
		temp.tv_sec = end.tv_sec-start.tv_sec;
		temp.tv_nsec = end.tv_nsec-start.tv_nsec;
	}
	return temp;
}