70.打印时分秒时钟，隔1秒刷新1次屏幕

 1 //做一个时分秒时钟
 2 
 3 #include 
 4 #include 
 5 
 6 #include 
 7 #include 
 8 
 9 #include 
10 using namespace std;
11 
12 int main()
13 {
14     time_t t;
15     struct tm* tt;
16     while(1)
17     {
18        time(&t);
19        tt = localtime(&t);
20       // printf("%02d:%02d:%02d\n",tt->tm_hour,tt->tm_min,tt->tm_sec);//c
21        cout<'0')<2)<tm_hour<<":"<2)<tm_min<<":"<2)<tm_sec<//c++
22        Sleep(1000);
23        system("cls");
24     }
25     cout << t << endl;
26     return 0;
27 }