Support Forums

Ok so this is a really n00bish question but i cant seem to find an answer for this.

Here is my source code:

Code:
class NewRoot {

    public static void main(String[] args){

        int number = 100;

        if (args.length > 0) {

            number = Integer.parseInt(args[0]);

        }

        System.out.println("The square root of "

                + number

                + " is "

                + Math.sqrt(number));

    }

}

I went to Run>Set Project Configuration>Customize and changed the argument to 169. I ran the file and it gives me the output of

Code:
The square root of 100 is 10.0

My question is why is it not taking the argument of 169 instead of evaluating 100? I checked the length of the argument and its 3. Any help would be appreaciated. Dont be to harsh im still begining Java.

Well I'm no Java expert but the only function argument you have is:

Code:
(String[] args)

If you want it to evaluate a different number you can just manually change

Code:
int number = 100;

Or you can make it ask for user input.
For example, running this code:

Code:
class NewRoot {

    public static void main(String[] args){

        int number = 25;

        if (args.length > 0) {

            number = Integer.parseInt(args[0]);

        }

        System.out.println("The square root of "

                + number

                + " is "

                + Math.sqrt(number));

    }

}

Makes it output the square root of 25.
Similarly, this script asks for a number from the user using a scanner object:

Code:
import java.util.*;

class NewRoot {

    public static void main(String[] args){

        Scanner numscan = new Scanner(System.in);

        System.out.print("What number do you want the square root of?:");

        int number = numscan.nextInt();

        if (args.length > 0) {

            number = Integer.parseInt(args[0]);

        }

        System.out.println("The square root of "

                + number

                + " is "

                + Math.sqrt(number));

    }

}

The output is:

Code:
What number do you want the square root of?:25

The square root of 25 is 5.0

Hope this helped!
More on scanner objects here

Ok that helps a little bit but maybe i should have worded it my question a little better. Before I ran it i changed the arguments in NetBeans to "169". So when the file tests

Code:
if(args.length > 0){

which should test as true. Afterwards it should run

Code:
number = parse.Interger(args[0]);

. This changes or casts the value of "number" to the arguments given to the program, because the length of 169 is = 3. So then after this it should run the last line which should display the output of

Code:
The square root of 169 is 13

. Why is it not changing the value of "number" to the argument of 169. Maybe I'm missing something? Is there anything that would make my theory illogical? I like your suggestions though, much appreaciated.

shadywatcher212

uber1337

shadywatcher212