Java Community | Help. Code. Learn.•3mo ago

Why do I need the abs method

23 Replies

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dan1st•3mo ago

if a is >10, abs() turns the result into a positive number similar with b abs(10-a) calculates how much a is away from 10 if it wasn't there, it would just prefer the highest number no matter what

blueOP•3mo ago

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 @dan1st | Daniel

dan1st•3mo ago

if a number is negative, it returns the positive version e.g. abs(-5) is 5

blueOP•3mo ago

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

dan1st•3mo ago

-(-5) is 5, right? -a changes the sign

blueOP•3mo ago

aaahhh hhaha

dan1st•3mo ago

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

blueOP•3mo ago

thanks a bunch got totallly confused there!!

JavaBot•3mo ago

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blueOP•3mo ago

Coulf I ask you another question if you have time

JavaBot•3mo ago

Don't ask to ask. Just ask!

blueOP•3mo ago

haha got it thanks just one sec need to copy the code

john•3mo ago

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");

    }
}

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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blueOP•3mo ago

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 Can´t quite find my fault here

dan1st•3mo ago

read() doesn't read a number

blueOP•3mo ago

Should I use readInt

dan1st•3mo ago

it reads a character and converts it to a number Which readInt? If you use Scanner, you could use nextInt or you could use BufferedReader#nextLine and then convert it to an int using Integer.parseInt

blueOP•3mo ago

Yup that version worked but with BufferReader no clue Ah got it will try it Javadoc things Thanks a lot you really cleared up a lot for me!!

JavaBot•3mo ago

Unknown User•3mo ago

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dan1st•3mo ago

this isn't about Math.abs() btw

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Why do I need the abs method