Java Celestial Volume Calculator: Earth and Sun Volumes Comparison

This Java program calculates and displays information about the volumes of the Earth and the Sun. It also show the ratio of their volumes. Here’s a step-by-step explanation for a novice Java programmer:

Variable Initialization:

sunRad and earthRad are initialized with the radii of the Sun and Earth respectively.
fourOverThree is set to the value of 4.0 divided by 3.0.
sunVol, earthVol, and ratioVol are declared and initialized to 0.

Volume Calculation:

Using the formula for the volume of a sphere (V = 4/3 * π * r^3), the program calculates the volumes of the Earth (earthVol) and the Sun (sunVol).
Math.pow(x, y) is used to raise a number to the power of another.

Volume Ratio Calculation:

The program calculates the ratio of the Sun’s volume to the Earth’s volume (ratioVol).

Output in Words:

The program then prints the results to the console using System.out.println.
The volumes of the Earth and the Sun are displayed in cubic miles, and the ratio of the Sun’s volume to the Earth’s volume is shown.

Additional Method (convertToWords):

To make the output more readable we have written a method called convertToWords.
This method takes a double value and converts it to words, appending appropriate unit names (thousand, million, etc.).

public class Volumes
{
  public static void main(String[] args)
  {
    // Initialize a double variable to be the sun's diameter
    double sunRad = 865000.0/2.0;
    double earthRad = 7926.4/2.0;
    double fourOverThree = 4.0/3.0;
    double sunVol = 0, earthVol = 0; // You can declare a number of variables
    double ratioVol = 0;             // of the same type on a single line if you wish.

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

  // Method to convert a double value to words
  private static String convertToWords(double value) {
    String[] units = {"", "thousand", "million", "billion", "trillion", "quadrillion"};
    int i = 0;
    while (value >= 1000) {
      value /= 1000;
      i++;
    }
    return String.format("%.2f %s", value, units[i]);
  }
}

public class Volumes

{

public static void main(String[] args)

{

// Initialize a double variable to be the sun's diameter

double sunRad = 865000.0/2.0;

double earthRad = 7926.4/2.0;

double fourOverThree = 4.0/3.0;

double sunVol = 0, earthVol = 0; // You can declare a number of variables

double ratioVol = 0; // of the same type on a single line if you wish.

// 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 in words

System.out.println("Volume of the earth is approximately " + convertToWords(earthVol) + " cubic miles.");

System.out.println("Volume of the sun is approximately " + convertToWords(sunVol) + " cubic miles.");

System.out.println("The sun's volume is approximately " + convertToWords(ratioVol) +

" times greater than the earth's.");

}

// Method to convert a double value to words

private static String convertToWords(double value) {

String[] units = {"", "thousand", "million", "billion", "trillion", "quadrillion"};

int i = 0;

while (value >= 1000) {

value /= 1000;

i++;

}

return String.format("%.2f %s", value, units[i]);

}

Java Celestial Volume Calculator: Earth and Sun Volumes Comparison

About The Author

M. Saqib

Java Celestial Volume Calculator: Earth and Sun Volumes Comparison

About The Author

M. Saqib

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