#include<windows.h>
Sleep(milliseconds);
#include<unistd.h>
unsigned int microsecond = 1000000;
usleep(3 * microsecond);
#include <chrono>
#include <thread>
int main() {
using namespace std::this_thread;
using namespace std::chrono;
sleep_for(nanoseconds(10));
sleep_until(system_clock::now() + seconds(1));
}
#include <chrono>
#include <thread>
int main() {
using namespace std::this_thread;
using namespace std::chrono_literals;
using std::chrono::system_clock;
sleep_for(10ns);
sleep_until(system_clock::now() + 1s);
}