JAVA: Cleaning up an ugly equation

Garda · 08-06-2007, 11:58 PM

I have the following equation in java

Code:

class ex2
{
	public static void main(String args[])
	{
		double a = 1.704*(144.8-101.3)*Math.pow(10,3) + 1.580*(154.4-101.3)*Math.pow(10,3) + 121*(362.7-269.7)+ 605.5*(328.6-269.7);
		System.out.println(a);
		
	}
}

Is there a nicer way of writing that
Like, how can I put the assignment of variable 'a' onto more lines. Curly brackets don't work like I thought they would

Nylex · 08-07-2007, 12:13 AM

Just split it over more lines, whitespace doesn't matter.

loincloth170 · 08-07-2007, 11:38 AM

Store Math.pow(10, 3) in a variable. It won't cost that much space at all and might make it look a little cleaner

95se · 08-07-2007, 12:26 PM

Quote:

Originally Posted by loincloth170

Store Math.pow(10, 3) in a variable. It won't cost that much space at all and might make it look a little cleaner

The JVM would have to store the intermediate result somewhere anyways, so it won't take up any more space then it would have in the first place. I wouldn't be suprised if both ways produced the same result in the compiled code even.

I would probably do either this,

Code:

class ex2
{
	public static void main(String args[])
	{
		double t1 = 1.704 * (144.8 - 101.3) * Math.pow(10, 3);
		double t2 = 1.580 * (154.4 - 101.3) * Math.pow(10, 3);
		double t3 = 605.5 * (328.6 - 269.7);

		double a = t1 + t2 + t3;

		System.out.println(a);
		
	}
}

or

Code:

class ex2
{
	public static void main(String args[])
	{
		double a = 1.704 * (144.8 - 101.3) * Math.pow(10, 3)
			   + 1.580 * (154.4 - 101.3) * Math.pow(10, 3)
			   + 605.5 * (328.6 - 269.7);

		System.out.println(a);
		
	}
}

Hope that is what you're looking for.

rupertwh · 08-07-2007, 12:56 PM

Well you could just write it as

Code:

 double a = 204938.95;

SCNR

Garda · 08-07-2007, 05:19 PM

Many thanks guys!

I didn't realise you could just put it on separate lines, I thought I needed curly brackets or something.

PTrenholme · 08-07-2007, 05:52 PM

And why would anyone in her right mind call pow(10,3) to calculate 1000?

Garda · 08-07-2007, 05:59 PM

Quote:

Originally Posted by PTrenholme

And why would anyone in her right mind call pow(10,3) to calculate 1000?

From experience, it's always a better idea to get a calculator (or in this case a computer) to do calculations for you rather than taking shortcuts by doing them in your head.