怎么知道rand当前的种子

如何知道rand当前的种子
用rand生成为随机数：
srand(seed);
rand();
rand();
如何得到第二个rand的种子
求助，急用，谢谢！

[解决办法]
参考C:\Program Files\Microsoft Visual Studio 10.0\VC\crt\src\rand.c

C/C++ code

/****rand.c - random number generator**       Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:*       defines rand(), srand() - random number generator********************************************************************************/#include <cruntime.h>#include <mtdll.h>#include <stddef.h>#include <stdlib.h>/****void srand(seed) - seed the random number generator**Purpose:*       Seeds the random number generator with the int given.  Adapted from the*       BASIC random number generator.**Entry:*       unsigned seed - seed to seed rand # generator with**Exit:*       None.**Exceptions:********************************************************************************/void __cdecl srand (        unsigned int seed        ){        _getptd()->_holdrand = (unsigned long)seed;}/****int rand() - returns a random number**Purpose:*       returns a pseudo-random number 0 through 32767.**Entry:*       None.**Exit:*       Returns a pseudo-random number 0 through 32767.**Exceptions:********************************************************************************/int __cdecl rand (        void        ){        _ptiddata ptd = _getptd();        return( ((ptd->_holdrand = ptd->_holdrand * 214013L            + 2531011L) >> 16) & 0x7fff );}
[解决办法]
第二个用的种子是 前一个种子 * 214013L+ 2531011L;
LZ仔细分析一下这句：
return( ((ptd->_holdrand = ptd->_holdrand * 214013L
           + 2531011L) >> 16) & 0x7fff );

注意里面的括号嵌套。