double function and double variable

08-05-2006, 06:31 AM

How exactly does a double function work?
How does a double variable work?

here is an example:

Code:

double getMobXP(int playerlvl, int moblvl)
{
	if(moblvl >= playerlvl) {
		double temp = ((playerlvl * 5) + 45) * (1 + (0.05 * (moblvl - playerlvl)));
		double tempcap = ((playerlvl * 5) + 45) * 1.2;
		if(temp > tempcap) {
			return floor(tempcap);
		}
		else {
			return floor(temp);
		}
	}
	else {
		if(getConColor(playerlvl, moblvl) == 0) {
			return 0;
		}
		else {
			return floor((playerlvl * 5) + 45) * (1 - (playerlvl -  moblvl)/getZD(playerlvl));
		}
	}
}

08-05-2006, 09:20 AM	#2
Jacek	Erm... double is like float but more precise

08-05-2006, 10:27 AM	#3
Linera	What is a float? p.s. I don't know c++

08-05-2006, 10:29 AM	#4
Mezzer	A double is a (potentially) longer real number, and you use it as such

08-05-2006, 10:34 AM	#5
Linera	I would like to know how it works

08-05-2006, 10:37 AM	#6
PitzerMike	It works like an int just that it's a float point number: Code: double d = 0.99; return d;

08-05-2006, 12:37 PM	#7
Vexorian	doubles take 8 bytes in 32 bits architectures, and floats 4 . So doubles are more precise and have less limits

08-05-2006, 06:07 PM	#8
Linera	ummmm, I'm still confused.

08-05-2006, 06:30 PM	#9
Alevice	It's just like a real variable. By precision, understand it as it lets you have much more decimals. Don't worry much about it.

08-05-2006, 11:32 PM

#10

PipeDream

It's a number written in hardware in scientific notation. Take 5.3*10^2. There's a mantissa (5.3) and an exponent (2) and a sign (+). This abstracts the precision (bits you give to the mantissa) from the range (bits you give to the exponent). For a double, you get around 15 digits of precision and a range up to 10^300ish. For floats, you get around 7 digits of precision and a range up to 10^40ish.

Floating point arithmetic is tricky to get right. It has many non intuitive limitations. Google around for tutorials.

Search for IEEE 754 if you're curious about how it works on a bit level.

08-05-2006, 11:34 PM	#11
Chrono Trigger	Where can i find free 3DSMAX 4?

08-06-2006, 12:21 AM

#12

Linera

Quote:

Originally Posted by Chrono Trigger

Where can i find free 3DSMAX 4?

1st off, Wrong forum.

2nd off, Wrong topic.

08-06-2006, 01:04 AM

#13

Tim.

Quote:

Originally Posted by Chrono Trigger

Where can i find free 3DSMAX 4?

Read our Rules and don't go offtopic.