用stringstream進行格式化輸出

用C++的方式也可以進行格式化輸出，

下面一段代碼使用stringstream進行格式化輸出，供參考。

#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;

}