输入字母就刷屏！咋回事呢

输入字母就刷屏！怎么回事呢？
今天编一个很简单的程序试了一下其他都好就是一输入字母就刷屏，不知道是什么原因，恳请各位大虾帮忙啊！
下面是程序：
#include <iostream>

void   time(int   hours,int   minutes);

int   main()
{
    using   namespace   std;

    int   hours,minutes;

    cout < < "Enter   the   number   of   hours: ";

    cin> > hours;

    while   (hours <0   ||   hours> 12)
    {
      cout < < "Your   hours   is   wrong!   Please   input   it   again! ";

      cin> > hours;
    }

    cout < <endl;

    cout < < "Enter   the   number   of   minutes: ";

    cin> > minutes;

    while   (minutes <0   ||   minutes> 60)
    {
      cout < < "Your   minutes   is   wrong!   Please   input   it   again! ";

      cin> > minutes;
    }

    cout < <endl;

    time(hours,minutes);

    cin.get();
   
    cin.get();

    return   0;

  }
 
  void   time(int   hours,int   minutes)
  {
    using   namespace   std;

    cout < < "Time: " < <hours < < ": ";

    if(minutes <10)
    {
      cout < < "0 " < <minutes < <endl;
    }
    else
    cout < <minutes < <endl;
  }

[解决办法]
在while循环中cin> > 的下面加入cin.clear(),cin.sync()两行代码，用以清除输入流缓冲区