Thread: Unsure

Hi guys just wanted to know what the following represents or means in java

%.2f

I used it in a program I wrote and still have no idea what it actually means, the code looks like this
import java.util.Scanner;

/** Area.java
* This program computes the area of a circle
* Date created: 12 February 2018 */

public class Area {
public static void main(String []args) {
//constant declaration
final Double PI = 3.142159;

//variable declaration
double area, radius;

//input
Scanner sc = new Scanner(System.in);
System.out.print("Please enter the radius please: ");
radius = sc.nextDouble();

//processing
area = PI * radius * radius;

//output
System.out.printf("The area of the circle = %.2f", area);
}
}

That is a type of format of printf method to print in monitor
%.2f means : the % character takes it's usual meaning here -- to substitute with a value (here, with 2 decimal places)
that depend on your situations every place you need two float decimal number you can use that or maybe in other situation you need other format like that

// radius is 6; the area of the circle = 113.12
System.out.printf("num is %f\n",area );

// radius is 6 ; the area of the circle = 113.117724
System.out.printf("num is %.2f\n", area );

if you don't understand my answer not problem just ask question