Code to check time information from system with different units

chrono_test.cpp

#include <iostream>
#include <chrono>
#include <unistd.h>
using namespace std;
// main function to measure elapsed time of a C++ program
// using chrono library
int main()
{
	auto start = chrono::steady_clock::now();
	// do some stuff here
	sleep(3);
	auto end = chrono::steady_clock::now();
	cout << "Elapsed time in nanoseconds : "
		<< chrono::duration_cast<chrono::nanoseconds>(end - start).count()
		<< " ns" << endl;
	cout << "Elapsed time in microseconds : "
		<< chrono::duration_cast<chrono::microseconds>(end - start).count()
		<< " µs" << endl;
	cout << "Elapsed time in milliseconds : "
		<< chrono::duration_cast<chrono::milliseconds>(end - start).count()
		<< " ms" << endl;
	cout << "Elapsed time in seconds : "
		<< chrono::duration_cast<chrono::seconds>(end - start).count()
		<< " sec";
	return 0;
}