Java Question

[Herr.Wenz]

I need help from any person that knows Java

I have writen a program and I am almost done expect stuck on one line of code, I am trying to write a command to make the program always round down

example 103.7 to 103

please anyone that can help would be appreciated

thanx

[wonderboy2005]

I dont know in java, but in c++ (which java is based off of) you could do somthing like this:

int a; (a is an integer variable)
double b; (b is a real number variable)

... input getting data for variable b...

a = b;

a will then become a truncated form of b, rounding down regardless of what lies beyond the decimal point.

[muffenme]

It is like c++ but you forgot (int)

eg

int a;
double b;
...
a = (int)b;

[wonderboy2005]

It is like c++ but you forgot (int)

eg

int a;
double b;
...
a = (int)b;
if you are referring to how it should be in c++, I compiled a program that worked exactly as I described before (including the a = b statement that didn't do any type casting) and it worked perfectly.

[shawners]

dont round up if higher then 5?

[zpman]

please show me your code so far.

declaration and method for starters.

If you want help, I will help you with your code, but I won't write it for you. I was a tutor for many things, including Java.

I will tell you if you are getting close, or horribly off. That's how I learned it, and will not contribute to cheating. But I will always contribute to teaching/tutoring and learning.

[GregorK]

The easiest and savest way:

int result = (int) Math.floor( value );

[zpman]

The easiest way:

int result = Math.floor( value );

This is correct where:

roundToInteger( number )

I just wanted our friend to try a bit harder to figure it out is all, heh.

so an example of this method could be:

y = Math.floor(x + .5 );

[Herr.Wenz]

thanx guys for the help I gave up and just turned it in, I will submit the code for you guys to see what I was missing

what I round up doing to finish the code was cast and make it into an integer but that would knock off one whole number

[zpman]

thanx guys for the help I gave up and just turned it in, I will submit the code for you guys to see what I was missing

what I round up doing to finish the code was cast and make it into an integer but that would knock off one whole number

using float or double?

[Herr.Wenz]

//Here it is boys, see what you can find that I missed and again thanx for the help

import java.util.Scanner;
import java.text.DecimalFormat;

public class Party
{
public static void main(String[] args)
{
int radius, height,guests;

double volume,gallons;

Scanner scan= new Scanner (System.in);

System.out.println("Enter the radius of the trash can, in inches::");
radius=scan.nextInt();


System.out.println("Enter the height of the liquid in the trash can, in inches:");
height=scan.nextInt();

volume=Math.PI*Math.pow(radius,2)*height;

gallons=volume/231.0;

guests=(int)gallons*3+1; // this is what was giving me the trouble, I added the one back that the casting took off but it seems not all inputs were accurate


DecimalFormat fmt= new DecimalFormat ("0.#");

DecimalFormat fmt1=new DecimalFormat ("0");

System.out.println("Your trash can will hold " + fmt.format(gallons)+" gallons of punch.");

System.out.println("Invite " + fmt1.format(guests) +" guests over!");


}
}

[muffenme]

This another way to do it in java.

int a;
double b;

...
a = mod(b,1);

I don't normally use java so I'm not sure

[ducttapeBigSexy]

Assuming you're free to declare things as you want (as in, this isn't an assignment, etc.), here's what I'd do:

double guests;
DecimalFormat df = new DecimalFormat("0");
// ...
guests = gallons * 3;
// ...
System.out.println("Guests: " + df.format(guests) );


Otherwise, if guests has to be an integer, just do this:
guests = Math.floor(gallons * 3);


If you're still stuck, try looking through Sun's Java Doc: http://java.sun.com/j2se/1.5.0/docs/api/index.html

P.S. If you want to get really anal, you technically didn't close the scanner (scan.close() ), and the end of your main method should have a System.exit(0); - sometimes, without it, it won't end the program when it's done executing (but, that's mostly if you're dealing with multiple threads, such as when you're making a GUI). Also, the first line in the method should be System.out.println("ducttapeBigSexy is awesome!"); - ok, jk about that last one ;)