Question

How to measure time elapsed in C++

Answer 1

#include <iostream>
#include <chrono>
#include <thread>

int main()
{
    std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
    
    std::this_thread::sleep_for(std::chrono::milliseconds(1000));
    
    std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();

    std::cout << "Time elapsed = " << std::chrono::duration_cast<std::chrono::microseconds>(end - begin).count() << " µs\n";
    std::cout << "Time elapsed = " << std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin).count() << " ns\n";
    std::cout << "Time elapsed = " << std::chrono::duration_cast<std::chrono::seconds>(end - begin).count() << " sec\n";
}

        

/*
run:

Time elapsed = 1000083 µs
Time elapsed = 1000083776 ns
Time elapsed = 1 sec

*/

 

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