Help with Scientific Notation in Java

[kawaiiresachan]

Hi, I am a college freshman and I am taking my very first Java programming class. I have never programmed before, so I am having a little bit of trouble. For our second lab, we are to put numbers into scientific notation using the mod (%) and printf operator. I am having trouble doing this, so could some body help me figue out what I need to do? Here is a copy of my code:

 import java.util.Scanner;

public class UniversalGravitation {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
				
		double m1;
		double m2;
		double r;
		double a1;
		double a2;
		final double G = 6.67384e-11;
				
		Scanner keyboard =  new Scanner(System.in);
		
				
		System.out.print("Enter the mass of the first object (in kilograms) ");
		m1 = keyboard.nextDouble();
		System.out.print("Enter the mass of the second object (in kilograms) ");
		m2 = keyboard.nextDouble();
		System.out.print("Enter the dsitance (in meters) between them ");
		r = keyboard.nextDouble();
		
		
		double F = G * ((m1*m2)/Math.pow(r, 2));
		a1 = F/m1;
		a2 = F/m2;
		
		System.out.printf("Mass of first object: \t\t" + m1 + "kg");
		System.out.println("Mass of second object: \t\t" +  m2 + " kg");
		System.out.println("Distance: \t\t\t" + r + " m");
		System.out.println("Force: \t\t\t\t" + F + "N");
		System.out.println("Acc. of first object: \t\t" + a1 + "m/s^2");
		System.out.println("Acc. of second object: \t\t" + a2 + " m/s^2");
	
	}

}

[VIPStephan]

Java != JavaScript

Moved to the correct forum.

[Fou-Lu]

I'm not sure why you are using the modulus operator here at all. With a printf, you can simply use %e or %E to display as scientific notation. Although, with doubles of these magnitudes, they will likely all show up as notation in the print/println calls anyway.