are of integers (with unsigned long long) and returns the respective duration alias from the std::chrono header, e.g. std::chrono::seconds, while the other deals with floating point values. You use them like so:</div>
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<div><span style="font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #e448ab">int</span> <span style="font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures">main(</span><span style="font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures;