#include <iostream>
#include <chrono>
#include <thread>
int main() {
for (int i = 0; i < 5; i++) {
std::cout << "second: " << i + 1 << "\n";
std::this_thread::sleep_for(std::chrono::milliseconds(1000));
}
}
/*
run:
second: 1
second: 2
second: 3
second: 4
second: 5
*/