/**
 * Weight Calculator > Essentials3.java 
 *
 * Displays a table of calculated weights on Jupiter using console output.
 * Illustrates precedence and parenthesis, type cast, named constant, while loop
 * 
 * @author  Dale Reed
 */

public class Essentials3 {
    
    public static void main(String[] args) {
            
        // variable declarations
        int earthWeight = 100;          // weight on the earth, declared and initialized
        int jupiterMassFactor = 318;    // Jupiter has 318 times the mass of Earth
        int jupiterRelativeRadius = 11; // Jupiter has radius 11 times greater than Earth's
         
        // Calculate multiplier to compare earth and Jupiter weights
        double weightMultiplier = (double)jupiterMassFactor / 
                                            (jupiterRelativeRadius * jupiterRelativeRadius);
        System.out.print("Multiply Earth Weight by " + weightMultiplier);
        System.out.print(" to find Jupiter weight. \n\n");

        // display a table of weights on earth and Jupiter
        final int WEIGHT_INCREMENT = 20;       // increment between earth weights in table rows
        System.out.println("Earth    Jupiter ");  // table heading     
        int loopCounter = 0;                      // loop iterations counter
        
        while (loopCounter < 7) {
            System.out.print( " " + earthWeight);
            System.out.println( "     " + (earthWeight * weightMultiplier) );
            loopCounter = loopCounter + 1;      // same as loopCounter++
            earthWeight = earthWeight + WEIGHT_INCREMENT;    
                // The above line is the same as: earthWeight += WEIGHT_INCREMENT;
        }

        System.out.println("\nDone.");
     }    
}

/* Output:

Multiply Earth Weight by 2.628099173553719 to find Jupiter weight. 

Earth    Jupiter 
 100     262.8099173553719
 120     315.3719008264463
 140     367.9338842975207
 160     420.4958677685951
 180     473.05785123966945
 200     525.6198347107438
 220     578.1818181818182

Done.

*/