Converting float to int (was: Re: [Dev-C++] (no subject) )

[Tim S. <ti...@we...>]

Hi 'neo',

you have written:

> Question: How to convert the a double date into a string,without using
> some certain function of the library?

If you would use C++ this would be very easy with use of the
stringstream class. Writing your own function is not hard but needs a
bit time. You have to split your double into the float  part and an
integer part.

double flnumber = 233.141592;
int integerpart = (int) pi;
double floatpart = ((int)pi) - pi;
std::string number;

Now you must parse your integerpart with something like this:

while(integerpart <= 0)
{
	number.append(int2char(integerpart - ((integerpart / 10)* 10));
	integepart  /= 10;
}

char int2char(int digit)
{
	switch(digit)
	{
		case 0:
			return '0';
			break;
		...
		default:
			return '\0';
			break;
	}
}

Now we are comming to the floatpart:

number.append(",");
while (floatpart <= 0)
{
	number.append(int2char((int)(floatpart * 10)));
	floatpart *= 10;
}

No guarantee that it works, but I think you get the idea how it should
be done.

so long

Tim

-- 
http://we-are-teh-b.org/~tim/borg.key