RT

使用Randomize

我用过了Randomize,但每次启动还是一样的,真是令人费解

在用Rnd之前用一下Randomize,我的没有问题,你的,我就不知道了.

提供一个随机数发生器的类，比rand()函数产生的随机数好（重复周期长）,有興趣的話可以用在VB裏麵```

// Random.h

class CRandom
{

public:
CRandom();
CRandom::CRandom(LPCSTR strKey){RandShuffle(strKey);}

virtual ~CRandom();

void RandShuffle(const CString strKey); //初始化
double RandReal(double x,double y);
double RandNormal(double mean,double stddev);
int RandInteger(int a,int b);
double RandFrac(void);
double RandExponential(double mean);
long Rand(void);
private:
long m_nDataList[100];
};


//------------------------------------------------------------------------
//Random.cpp

#include "stdafx.h"
#include "Random.h"
#include <math.h>

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CRandom::CRandom()
{

}


CRandom::~CRandom()
{

}


void CRandom::RandShuffle(const CString strKey)
{
CString key = "Abra Ca Da Bra" + strKey + CString(' ',83);
key = key.Left(97);

int i; char c;

for(i = 0; i <97; i++){
c = key.GetAt(i);
m_nDataList[i] =c * 8171717 + i +997;
}

key ="";

i = 96;
int j = 11;

for(int k = 0; k < 997; k++){
m_nDataList[i] = m_nDataList[i] - m_nDataList[j];
if(m_nDataList[i] < 0) m_nDataList[i]+=1000000000;
if(i>0){
i -= 1;
}
else{
i = 96;
}
if(j >0){
j -= 1;
}
else{
j = 96;
}
}

m_nDataList[97] = 55;
m_nDataList[98] = 24;

m_nDataList[99] = 77;
}


long CRandom::Rand()
{
long i = m_nDataList[97];
long j = m_nDataList[98];

int t = m_nDataList[i] - m_nDataList[j];
if(t <0) t+=1000000000;
m_nDataList[i] = t;

if(i>0)
m_nDataList[97] = i -1;
else
m_nDataList[97] = 54;

if(j>0)
m_nDataList[98] = j - 1;
else
m_nDataList[98] = 54;

i = m_nDataList[99] % 41 +55;
m_nDataList[99] = m_nDataList[i];
m_nDataList[i] = t;

return m_nDataList[99];

}


double CRandom::RandExponential(double mean)
{
return (-mean * log(RandFrac()));
}


double CRandom::RandFrac()
{
return (Rand() /1e9);
}


int CRandom::RandInteger(int a, int b)
{
ASSERT(a < b);
return (a + (Rand() % (b - a + 1)));
}


double CRandom::RandNormal(double mean, double stddev)
{
double u1 = RandFrac();
double u2 = RandFrac();
double x = sqrt(-2 * log(u1)) * cos(6.283185 * u2);
return (mean + stddev * x);

}


double CRandom::RandReal(double x, double y)
{
return (x + (y-x) * Rand() / 1e9);
}

谢谢purana,好了,很奇怪,昨天我用了这个的还是一样

好像是一个 随机种子之类的函数吧，都要忘完了

记得第一次用这个的时候好像这作一个，返回当前时间（随机颜色的）一个东西

现在大要钱要忘了