#include <stdlib.h>
#include <iostream>
#include <chrono>

#define TIMER_START { \
	using namespace std::chrono; \
	auto t0 = high_resolution_clock::now();
#define TIMER_END(percision) \
	auto t1 = high_resolution_clock::now(); \
	std::cout << duration_cast<percision>(t1 - t0).count() << " "#percision"\n"; \
	}

int main(){
	TIMER_START
	int sum = 0;
	for(int i=0; i<100000000; i++)
		sum += i;
	TIMER_END(milliseconds)

	system("pause");
	return 0;
}