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+<file c++ chrono_stop_watch.cc>
+#include <iostream>
+#include <chrono>
+#include <ctime>
+long fibonacci(unsigned n)
+{
+    if (n < 2) return n;
+    return fibonacci(n-1) + fibonacci(n-2);
+}
+int main()
+{
+    std::chrono::time_point<std::chrono::system_clock> start, end;
+    start = std::chrono::system_clock::now();
+    std::cout << "f(42) = " << fibonacci(42) << '\n';
+    end = std::chrono::system_clock::now();
+    std::chrono::duration<double> elapsed_seconds = end-start;
+    std::time_t end_time = std::chrono::system_clock::to_time_t(end);
+    std::cout << "finished computation at " << std::ctime(&end_time)
+              << "elapsed time: " << elapsed_seconds.count() << "s\n";
+}
+</file>

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