C++while循环编写延时程序

#include <iostream>
#include <ctime>
using namespace std;

int main()
{
  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";
  system("pause");
  return 0;
}