问题标题: 求用法

延时:    Sleep(x);函数，中间写x毫秒

            头文件:#include<Windows.h>

清空:    memset()函数:memset(字符串,0,sizeof(字符串));

            头文件:#include<cstring>

计时:     计时开始：auto start = std::chrono::steady_clock::now();

             计时暂停：std::this_thread::sleep_for(std::chrono::seconds(1));

             计时结束：auto end = std::chrono::steady_clock::now();

             输出计时时间：std::chrono::duration<double> elapsed_seconds = end - start;

                                     std::cout << "Elapsed time: " << elapsed_seconds.count() << " seconds.\n";

              头文件:#include <chrono>

                         #include <thread>

随机函数:

             头文件：#include <iostream>#include <cstdlib>#include <ctime>

             定义：unsigned seed; 

             随机初始化：value for srand seed = time(0);

             结果：srand(seed);