Question

How to measure time in milliseconds using C++

Answer 1

#include <iostream>
#include <chrono>
 
int main() {
    auto startTime = std::chrono::high_resolution_clock::now();
 
    for (int i = 0; i < 400000000; i++);
 
    auto estimatedTime = std::chrono::duration_cast<std::chrono::milliseconds>(
                            std::chrono::high_resolution_clock::now() - startTime).count();
 
    std::cout << estimatedTime << " milliseconds" << std::endl;
}
 
 
 
/*
run:
 
243 milliseconds
 
*/

 

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Answer 2

#include <iostream>
#include <chrono>
 
int main() {
    auto startTime = std::chrono::high_resolution_clock::now();
 
    for (int i = 0; i < 400000000; i++);
     
    auto endTime = std::chrono::high_resolution_clock::now();
 
    auto estimatedTime = std::chrono::duration_cast<std::chrono::milliseconds>(endTime - startTime).count();
 
    std::cout << estimatedTime << " milliseconds" << std::endl;
}

 
 
 
/*
run:
 
252 milliseconds
 
*/

 

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