浮点数转换为字符串

自己写的一个浮点数转换为字符串的函数，有点简陋，因为不支持科学计数法

void citoa(int num, char* result,int& end);
void dectoa(float fNum, char* result,int& end);
// 浮点数转换为字符串
void floatToString(float f)
{
	int intPart = (int)f;
	float decimalPart = f - intPart;
	cout<<intPart<<endl;
	cout<<decimalPart<<endl;
	char floatString[100];
	int end = 0;
	if(0 != intPart)
	{
		citoa(intPart,floatString,end);
		floatString[end] = '.';
	}
	dectoa(decimalPart,floatString,end);
	printf(floatString);
	printf("\n");
}
// 整数转换为字符串
void citoa(int num, char* result,int& end)
{
	//if(0 == num)
	//{
	//	result[0] = '0';
	//	end = 1;
	//	return;
	//}

	int i = 0;
	// num is a negative number
	if(num < 0)
	{
		result[i] = '-';
		++i;
		num *= -1;
	}

	while(num > 0)
	{
		result[i] = (num % 10) + '0';
		num = num/10;
		++i;
	}
	if('-' == result[0])
		ReverseWord(result+1,result+i-1);
	else
		ReverseWord(result,result+i-1);
	end = i;
}
// 纯小数部分转换为字符串
void dectoa(float fNum, char* result,int& end)
{	
	int i = 0;
	if(0 == end)
	{		
		if(fNum < 0.0f)
		{
			result[0] = '-';
			i = 1;
			fNum = fNum * (-1);
		}
		result[i] = '0';
		result[i+1] = '.'; 
		end = i + 1;
	}

	if(fNum < 0.0f)
		fNum = fNum * (-1);

	while(fNum > 0.0f)
	{
		++end;
		fNum *= 10;
		int singleInt = (int)fNum;
		result[end] = singleInt + '0';
		fNum -= singleInt;
	}
	++end;
	result[end] = '\0';
}