求srand()和rand()函数用法
怎样用srand()和rand()实现整数0至10的不重复输出啊?
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srand((usnsigned int)time(NULL));
while(1)
{
printf("%d\n", rand() % 10);
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- C/C++ code
#include <stdlib.h> int rand(void); void srand(unsigned int seed); #include <time.h> time_t time(time_t *t);
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利用可利用的工具,查看msdn。
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linux平台也有帮助文档,利用man命令。
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srand和rand的使用简简单单像1和2楼那样,,至于不重复输出可以先保存10个bool代表10个数是否已经输出过判断一下就是了
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msdn里不就有例子??
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对了,如果对随机性要求高,不要用%10,用(int)(10.0*rand()/RAND_MAX),之前模拟硬币实验,发现前者的随机性有大问题
[解决办法]
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 );}