C/C++ Timer

// Calculate/determine the accurate variable timers at the first execution of the program,
// reguardless if the timer captured any time, print it to the screen.
// Then keep printing in calculating/determining the accurate variable timers until the program is halted.
//

#include <iostream>
#include <ctime>
#include <ratio>
#include <chrono>

using namespace std::chrono;

high_resolution_clock::time_point t1 = {};
high_resolution_clock::time_point t2 = {};
high_resolution_clock::time_point t3 = {};

int main ()
{
  while (1)
  {
    t2 = high_resolution_clock::now();

    // Calculate timer "t3":
    // How to display the correct time elapsed for "t3" for the first execution run? Current implementation will throw false readings:
    // How to determine the time elapsed for "t3" without "t2"?
    std::cout << "\nElapsed time for t3: " << std::chrono::duration_cast<std::chrono::milliseconds>(t2-t3).count() << " Secs\n\n";


    t1 = high_resolution_clock::now();
    int i;
    for (i = 0; i <= 100; i++)
    {
      printf("Hello World\n");
    }
    t2 = high_resolution_clock::now();

    std::cout << "Elapsed time for printf(Hello World): " << std::chrono::duration_cast<std::chrono::milliseconds>(t2-t1).count() << " Secs\n\n";

    // Timer t3, captures time reference at this point which will be calculated later when main() function loops again.
    t3 = high_resolution_clock::now();
  }

  return 0;
}