在C＋＋中延时

#include <iostream>
#include <string>
#include <cstring>
#include <ctime>

void wait(double seconds);

using namespace std;
int main()
{
    int i = 0;
    while (i<10)
    {
        cout << "start coutdown..." << i << " seconds!" << endl;;
        wait(i);
        i++;
    }
    cout << "Done! \a\n";
    return 0;
}

void wait(double seconds)
{
    clock_t delay = seconds * CLOCKS_PER_SEC;   //转化为延时的秒数
    clock_t start = clock();                                        //获取当前的时间
    while(clock()-start < delay)                                //比较时间是否在限定的延迟之内
        ;
}