学步园

用C++的方式也可以进行格式化输出，

下面一段代码使用stringstream进行格式化输出，供参考。

#include <sstream>
#include <iostream>

int main()
{
     std::stringstream ss_time;
     int year = 2012;
     int month = 1;
     int day = 30;
     int hour = 20;
     int minute = 30;
     int second = 0;

     ss_time << "time is ";
     ss_time.fill('0');

     ss_time.width(4);
     ss_time << year << "-";

     ss_time.width(2);
     ss_time << month << "-";

     ss_time.width(2);
     ss_time << day << " ";
 
     ss_time.width(2);
     ss_time << hour << ":";

     ss_time.width(2);
     ss_time << minute << ":";

     ss_time.width(2);
     ss_time << second << "\n";

     std::cout << ss_time.str();

     system("pause");

     return 0;
}