入门计划->使用(C++库)ostringstream输出(格式化)

//awzzz@2002
//入门计划->使用(C++库)ostringstream输出(格式化)
//APO->using ostringstream.
//accidence project of using ostringstream.(c++ iostream library)

/*
  Reference:

  Description

  ostringstream class provides an interface to manipulate strings as if
  they were output streams.

  The objects of this class mantain internally a pointer to a stringbuf
  object that can be obtained/modified by calling member rdbuf. This
  streambuf-derived object stores a sequence of characters (string) that
  can be obtained/modified by calling member str.
*/

//使用(C++库)ostringstream输出(格式化)
//simple example

#include
#include
#include
using namespace std;

void test()
{
    //ostringstream oss;
    //oss.str("abc");
    ostringstream oss("abc");
   
    cout << oss.str() << endl;

    oss << 8 << endl;
    oss << 3.14 << endl;
    oss << " ok ." << endl;

    cout << oss.str() << endl;

    oss << 8 << " "
        << 3.14 << " "
        << " ok ." << endl;

    cout << oss.str() << endl;
}

int main(int argc, char* argv[])
{  
    test();
    return 0;
}

输出:

abc
8
3.14
 ok .

8
3.14
 ok .
8 3.14  ok .

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