I have to write a program to generate Random Price that prints a random price between $10.00 and $19.95 every time the program is run.

atm i have this:


package pricegen;
//Price gen $10-19.95

import java.util.Random;


public class PriceGen {
public static void main(String[] args) {
Random rand = new Random();
double randomNum = rand.nextDouble(19.95 - 10);
System.out.println(randomNum);
}
}


This post was edited by urtuu on Sep 4 2013 04:10pm

Try this, although I can't guarantee it prints exactly what you want since I don't have anything to compile/run java code at hand...

double randomNum = rand.nextDouble(19.95 - 10) +10

Whelp, apparently I'm not familiar with the rand library...

try this

rand.nextDouble()*(19.95-10.0) + 10.0

The problem here is that nextDouble does not take a parameter; it spits out a double between 0 and 1

package pricegen;
//Price gen $10-19.95

import java.util.Random;



public class PriceGen {
public static void main(String[] args) {
Random randNumb = new Random();
rand.nextDouble()*(19.95-10.0) + 10.0;
System.out.println(randomNumb);


this is what i have now it is saying that it is not a statement.....and when i run it it says run:
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - not a statement
at pricegen.PriceGen.main(PriceGen.java:12)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

maybe because you never declared randomNumb and you didn't store the result of the calculation?

Try this

rand.nextDouble()*(19.95-10.0) + 10.0;
System.out.println(randomNumb);

change to
System.out.println(rand.nextDouble()*(19.95-10.0) + 10.0);

Edit:
sigh, don't make me break out my java compiler lol

This post was edited by zackill4 on Sep 4 2013 07:43pm

okay, that worked now is there a way to make it only 2 dec places?

DecimalFormat df = new DecimalFormat("##.##");
System.out.println(df.format(rand.nextDouble()*(19.95-10.0) + 10.0));

there are a few other ways to do this apparently

it says canot find symble

got it fixed lol, forgot the import

thanks for the tip