#Why do I need the abs method

39 messages · Page 1 of 1 (latest)

frozen island
foggy patioBOT
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unreal trail
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if a is >10, abs() turns the result into a positive number

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similar with b

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abs(10-a) calculates how much a is away from 10

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if it wasn't there, it would just prefer the highest number no matter what

frozen island
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I wrote that part of the code from the exercise but abs was given therefore my question but the number just stays the same if it is negative it will return that number and if it is positiv it will return a positive number does abs really change anything

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@unreal trail

unreal trail
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if a number is negative, it returns the positive version

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e.g. abs(-5) is 5

frozen island
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but shouldn`t it be return a if that was true it is -a in the code though that confuses me

unreal trail
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-(-5) is 5, right?

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-a changes the sign

frozen island
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aaahhh

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hhaha

unreal trail
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so if it's a negative number, the sign is changed to be positive

frozen island
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thanks a bunch got totallly confused there!!

foggy patioBOT
frozen island
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Coulf I ask you another question if you have time

foggy patioBOT
frozen island
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haha got it thanks just one sec need to copy the code

uneven flintBOT
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package de.codegym.task.task04.task0413;

/*
Wochentag
*/

import java.io.*;
import java.util.Scanner;


public class Solution {
   public static void main(String[] args) throws Exception {
       //schreib hier deinen Code

       BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
       int a = input.read();// read a number from keyboard
     
       //Scanner numberkind = new Scanner(System.in);
       //int a = numberkind.nextInt();


       if (a ==1 )
           System.out.println("Montag");
       else if (a == 2 )
       System.out.println("Dienstag");
       else if (a == 3 )
           System.out.println("Mittwoch");
       else if (a == 4 )
           System.out.println("Donnerstag");
       else if (a == 5 )
           System.out.println("Freitag");
       else if (a ==6  )
           System.out.println("Samstag");
       else if (a == 7 )
           System.out.println("Sonntag");

       else if ( a > 7 || a < 1) //condition always true
           // since if reached only option bigger or less
           // then given intervall
           //=> just else also enough
           System.out.println("Diesen Wochentag gibt es nicht");

   }
} ```

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frozen island
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I used the Scanner and always got the result I was trying to achieve but with BufferReader I only get the output "Diesen Wochentag gibt es nicht" even if I enter 5

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Can´t quite find my fault here

unreal trail
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read() doesn't read a number

frozen island
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Should I use readInt

unreal trail
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it reads a character and converts it to a number

unreal trail
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If you use Scanner, you could use nextInt

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or you could use BufferedReader#nextLine and then convert it to an int using Integer.parseInt

frozen island
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Yup that version worked

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but with BufferReader no clue

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Ah got it will try it

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Javadoc things

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Thanks a lot you really cleared up a lot for me!!

foggy patioBOT
tacit goblet
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The abs() method works for different primitive data types: int, long, float, and double. It returns the same type as the argument passed to it.

unreal trail