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Thread: Unsure

  1. #1
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    Default 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);
    }
    }

  2. #2
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    Default Re: Unsure

    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

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Unsure

    See the Formatter class's API doc for a description of how to make format strings
    https://docs.oracle.com/javase/8/doc...Formatter.html
    If you don't understand my answer, don't ignore it, ask a question.

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