70.打印时分秒时钟，隔1秒刷新1次屏幕

//做一个时分秒时钟

#include <iostream>
#include <time.h>

#include <process.h>
#include <windows.h>

#include <iomanip>
using namespace std;

int main()
{
    time_t t;
    struct tm* tt;
    while(1)
    {
       time(&t);
       tt = localtime(&t);
      // printf("%02d:%02d:%02d\n",tt->tm_hour,tt->tm_min,tt->tm_sec);//c
       cout<<setfill('0')<<setw(2)<<tt->tm_hour<<":"<<setw(2)<<tt->tm_min<<":"<<setw(2)<<tt->tm_sec<<endl;//c++
       Sleep(1000);
       system("cls");
    }
    cout << t << endl;
    return 0;
}