Calculate the Volume of Earth and Sun using Math Class | Java Example

The diameter of the sun is approximately 865,000 miles. The diameter of Earth is approximately 7600 miles. Use the methods in the class Math to calculate the following:

• ? The volume of Earth in cubic miles
• ? The volume of the sun in cubic miles
• ? The ratio of the volume of the sun to the volume of Earth

public class Volumes {
  public static void main(String args[]) {
    double sunRad = 865000.0/2.0;                                      // Sun radius in miles is half the diameter
    double earthRad = 7600.0/2.0;                                      // Earth radius likewise
    double fourOverThree = 4.0/3.0;                                    // A convenient constant, 4/3
    double sunVol = 0;
    double earthVol = 0;
    double ratioVol = 0;
/*
    You can declare several variables of the same type in a single statement if you wish,
    so we could write the definitions as:

     double sunRad = 865000.0/2.0, earthRad = 7600.0/2.0,
     double fourOverThree = 4.0/3.0;
     double sunVol = 0, earthVol = 0, ratioVol = 0;

   However, except in trivial cases it is better to declare variables in separate statements
   as this is clearer and reduces the possibility of errors.
*/

    // Find the volumes of earth and sun:
    earthVol = fourOverThree*Math.PI*Math.pow(earthRad,3);
    sunVol = fourOverThree*Math.PI*Math.pow(sunRad,3);

    // Find the ratio of their volumes:
    ratioVol = sunVol/earthVol;

    // Output the results:
    System.out.println("Volume of the earth is " + earthVol + " cubic miles");
    System.out.println("Volume of the sun is " + sunVol + " cubic miles");
    System.out.println("The sun's volume is " + ratioVol + " times greater than the earth's.");
  }
}

Output of Above Java Program
Volume of the earth is 2.2984729611703882E11 cubic miles
Volume of the sun is 3.3888078519931213E17 cubic miles
The sun's volume is 1474373.5990122468 times greater than the earth's.

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