void FloatToString(float fNum,char *pStr)
{
	unsigned int nData = ((unsigned int *)&fNum)[0];

	for (int i = 0;i < 32;i ++)
	{
		pStr[31 - i] = (char)(nData & 1) + '0';
		nData >>= 1;
	}
	pStr[32] = '\0';
}

void DoubleToString(double dNum,char *pStr)
{
	UINT64 nData = ((UINT64 *)&dNum)[0];

	for (int i = 0;i < 64;i ++)
	{
		pStr[63 - i] = (char)(nData & 1) + '0';
		nData >>= 1;
	}
	pStr[64] = '\0';
}
 

float StringToFloat(char *pStr)
{
	unsigned int nData = 0;
	float *pData;

	for (int i = 0;i < 31;i ++)
	{
		nData += (pStr[i] - '0');
		nData <<= 1;
	}
	nData += (pStr[31] - '0');
	pData = (float *)&nData;
	return *pData;
}

double StringToDouble(char *pStr)
{
	UINT64 nData = 0;
	double *pData;

	for (int i = 0;i < 63;i ++)
	{
		nData += (pStr[i] - '0');
		nData <<= 1;
	}
	nData += (pStr[63] - '0');
	pData = (double *)&nData;
	return *pData;
}
 

void PrintfBinary(unsigned char cData)
{
	for (int i = 7;i >= 0;i --)
	{
		if (cData & (1 << i))
		{
			cout << "1";
		} 
		else
		{
			cout << "0";
		}
	}
}

float fNum = 7.5;
unsigned char *pChar = reinterpret_cast<unsigned char *>(&fNum);
	
for(int i = sizeof(float) - 1; i >= 0; --i)
{
	PrintfBinary(pChar[i]);
}