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Stopwatch in C++

Creating a simple stopwatch in C++ involves measuring time intervals using the <chrono> library, which provides precise timekeeping capabilities. Here’s a basic example of how to create a stopwatch in C++:

C++
#include <iostream>
#include <chrono>
#include <thread>

class Stopwatch {
public:
    void Start() {
        startTime = std::chrono::high_resolution_clock::now();
        isRunning = true;
    }

    void Stop() {
        endTime = std::chrono::high_resolution_clock::now();
        isRunning = false;
    }

    void Reset() {
        startTime = endTime = std::chrono::high_resolution_clock::now();
        isRunning = false;
    }

    double ElapsedSeconds() {
        if (isRunning) {
            Stop();
        }
        std::chrono::duration<double> elapsed = endTime - startTime;
        return elapsed.count();
    }

private:
    std::chrono::time_point<std::chrono::high_resolution_clock> startTime;
    std::chrono::time_point<std::chrono::high_resolution_clock> endTime;
    bool isRunning = false;
};

int main() {
    Stopwatch stopwatch;

    std::cout << "Press Enter to start the stopwatch..." << std::endl;
    std::cin.get();

    stopwatch.Start();

    std::this_thread::sleep_for(std::chrono::seconds(3)); // Simulate some work

    stopwatch.Stop();

    std::cout << "Elapsed time: " << stopwatch.ElapsedSeconds() << " seconds" << std::endl;

    return 0;
}

In this example:

  • We create a Stopwatch class with methods to start, stop, reset, and calculate the elapsed time in seconds.
  • The Start() method records the start time, the Stop() method records the end time, and the Reset() method resets the stopwatch to its initial state.
  • The ElapsedSeconds() method calculates the elapsed time in seconds based on the start and end times.
  • In the main function, we create a Stopwatch object, start it, simulate some work using std::this_thread::sleep_for(), stop it, and then display the elapsed time.

This is a basic example of a stopwatch. You can enhance it by adding features like lap times or a user-friendly interface for starting, stopping, and resetting the stopwatch.

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