Wait for a period of time: write delay loop

delay_loop.cpp

    #include <iostream>
    #include <ctime>

    int main()
    {
        using namespace std;
	cout << "Enter the delay time, in seconds: ";
	float secs;
	cin >> secs;
	clock_t delay = secs * CLOCKS_PER_SEC;
	cout << "starting\a\n";
	clock_t start = clock();
	while (clock() - start < delay)
		;
	cout << "done\a\n";
	return 0;
    }