Java a beginner's guide's a modified example

[Nipuna]

I am now referring Java a beginner's guide book.

Code: Select all

/*
Project 1-1
This program converts gallons to liters.
Call this program GalToLit.java.
*/

class GalToLit {

    public static void main(String args[]) {

        double gallons; // holds the number of gallons

        double liters; // holds conversion to liters

        gallons = 10; // start with 10 gallons

        liters = gallons * 3.7854; // convert to liters

        System.out.println(gallons + " gallons is " + liters + " liters.");
}
}

I've modified it as this. To get user inputs. I know one way of giving inputs That is giving values via parameters Not a so clever coding isn't it?

Code: Select all

class GalToLit{

   public static void main(String args[]){

      double gallons,liters;

      gallons = Double.parseDouble(args[0]);

      liters = gallons*3.7854;

      System.out.println(gallons+" gallons is "+ liters + " liters. ");
      

}
}

How is it?

PS: I had to add codes without syntax heightening since that function doesn't work. May be because of the server changing

[Neo]

Syntax highlighting works now. However to get it working correctly, you will have to use Tab for indents.

Also, taking you to another step...
How if someone enters a text value there instead of a floating point number? It will give you an error. Here is how you could handle that.

Code: Select all

try{
	gallons = Double.parseDouble(args[0]);
	
	liters = gallons * 3.7854;
	System.out.println(gallons+" gallons is "+ liters + " liters. ");	
}
catch (NumberFormatException e){
	System.out.println("Input must be a number!");
}

[Nipuna]

Great.

And another thing.

2 Smilies are not working

clap and laughing

By the way now Expertcore is working fast

[Neo]

By the way now Expertcore is working fast

Thanks Nipuna.

Smilies are not working

New smileys are back.

Notice my code mod with exception handling.

[Nipuna]

Wow! Cool ! You filled one of my memory gaps.

You are right, When learning concepts and in systematically, it's getting easy .