Re-assigning values to variables

[Vlada Den]

Dear Friends!

I cannot figure out how to re-assign the values for "x" and "value" in my code, so I can get the result for different values in one run of the program:

 
public class Quadradic
{
public static void main( String [] args )
{
double x = 2.0;
double value = 3 * x * x - 8 * x + 4;

System.out.println( "At x = 2.0 the value is: " + value );
}
}  
 

Thanks a lot for your responces!

Vlada

[Ryan McGuire]

You're asking how to run your program for different values of x without having to recompile all the time, right?

Look in the Integer class documenation. One of those methods will allow to turn a command line parameter (in args[]) into an int.

Ryan
[ April 18, 2005: Message edited by: Ryan McGuire ]

[Stan James]

I'm not sure where you are on your Java Journey, so excuse me if I start with some basics. Try moving your calculation & display into a method that takes an argument. If your main looked like this:

compute(2.0);
compute(3.5);
compute(42.0);
compute(437.5);

could you imagine what the compute method might look like?

Ryan's Integer hint (posted while I was typing, you rascal! ) is a good next step, figuring out how to use a command line parameter that the user passed to main.

Java MyProgram 123.456

[ April 18, 2005: Message edited by: Stan James ]

[Ryan McGuire]

And you posted while I was editting. Wacky!

Ryan