calculateVolumeCylinder()

Step 1: Initialize The Variables

The first step in writing a program to calculate the volume of a cylinder is to initialize the variables needed. In this case, we need variables for the radius and height of the cylinder, as well as a constant for pi.

final double pi = 3.14159;
double radius = 0;
double height = 0;

Step 2: Get The User Input

Next, we need to obtain the values for the radius and height from the user. To get the user input, we can use the Scanner class in Java. Note that we need to import the java.util.Scanner package at the beginning of our code to use the Scanner class.

import java.util.Scanner;
Scanner scan = new Scanner(System.in);
System.out.println("Enter the radius:");
radius = scan.nextDouble();
System.out.println("Enter the height:");
height = scan.nextDouble();

Step 3: Calculate The Volume

Now that we have our radius and height, we can calculate the volume of the cylinder. The formula to calculate the volume of a cylinder is pir^2h.

double volume = pi * Math.pow(radius, 2) * height;

Step 4: Output The Result

Finally, we need to output the volume that we have calculated. We can do this using the System.out.println() method.

System.out.println("The volume is: " + volume);

Conclusion

Here is the full code:

import java.util.Scanner;
public class Main {
  public static void main(String[] args) {
    final double pi = 3.14159;
    double radius = 0;
    double height = 0;

    Scanner scan = new Scanner(System.in);
    System.out.println("Enter the radius:");
    radius = scan.nextDouble();
    System.out.println("Enter the height:");
    height = scan.nextDouble();

    double volume = pi * Math.pow(radius, 2) * height;
    System.out.println("The volume is: " + volume);
  }
}