C++调用函数模仿数字钟表

调用系统函数，可以得到系统时间

 #include<iostream>
 #include<windows.h>
 #include<time.h>
 using namespace std;
 int main()
 {
     time_t rawtime;

     while(true){
     time(&rawtime);
     tm *timeinfo=localtime(&rawtime);
     system("cls");
     cout<<timeinfo->tm_year+<<"年"<<timeinfo->tm_mon+<<"月"<<timeinfo->tm_mday<<"日"<<endl;
     cout<<timeinfo->tm_hour<<":"<<timeinfo->tm_min<<":"<<timeinfo->tm_sec<<endl;
     Sleep();
     }
     return ;
 }