I need help | Java Community | Help. Code. Learn. | Page 1

random agate Feb 16, 2023, 2:13 AM

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i don’t understand ;-; why me 😦

balmy dockBOT Feb 16, 2023, 2:13 AM

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untold apex Feb 16, 2023, 2:22 AM

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You don't need to recreate the scanner like that

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For one

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Looks like that's what the problem is

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The compiler is complaining about you redefining the Scanner every time you need it (Looks like a case of accidentally copy-pasting it 😝)

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Just create it once at the beginning of your class

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It stays in memory until the main method stops executing

final crane Feb 16, 2023, 2:29 AM

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Yeah, you only need to declare one scanner object then you can reuse it

random agate Feb 16, 2023, 2:29 AM

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yes

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i see

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but now

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it has another issue

final crane Feb 16, 2023, 2:29 AM

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Show

random agate Feb 16, 2023, 2:30 AM

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untold apex Feb 16, 2023, 2:30 AM

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random agate it has another issue

Ah, tis is the life of a software developer

final crane Feb 16, 2023, 2:30 AM

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You are doing next int

random agate Feb 16, 2023, 2:30 AM

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Im a 14 year old in highschool ;-;

final crane Feb 16, 2023, 2:30 AM

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You need next line

random agate Feb 16, 2023, 2:30 AM

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yes

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uhhh

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confused

untold apex Feb 16, 2023, 2:30 AM

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btw, you shouldn't name variables like that

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keep them lowercase

random agate Feb 16, 2023, 2:31 AM

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i see

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its a basic csc 151 class i dont think she would mind

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how do i do the next line function?

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is it like

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inputDevice.nextLine();

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?

final crane Feb 16, 2023, 2:32 AM

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Yes

random agate Feb 16, 2023, 2:33 AM

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;-;

untold apex Feb 16, 2023, 2:34 AM

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That's just a command issue I think

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I don't think you broke anything

random agate Feb 16, 2023, 2:34 AM

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i dont get it

untold apex Feb 16, 2023, 2:34 AM

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I'm used to using an IDE 🙃

random agate Feb 16, 2023, 2:34 AM

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why am i such a bad coder

untold apex Feb 16, 2023, 2:34 AM

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Hey, don't worry.

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Try using javac again

final crane Feb 16, 2023, 2:35 AM

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I dont think its your fault it really just looks like whatever shitty online IDE you are using fault

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Switch to repl.it if you want a online IDE

untold apex Feb 16, 2023, 2:35 AM

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Unless your teacher said you had to use this garbage cengage thing

random agate Feb 16, 2023, 2:35 AM

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no no

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this is on cengage

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its an assignment

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my professor assigned this to me

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this is a college course so i need to finish this properly ;-;

final crane Feb 16, 2023, 2:36 AM

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change your class name to Main

random agate Feb 16, 2023, 2:37 AM

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I can't

final crane Feb 16, 2023, 2:37 AM

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why

random agate Feb 16, 2023, 2:37 AM

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not allowed

final crane Feb 16, 2023, 2:37 AM

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but its throwing an error because of it

random agate Feb 16, 2023, 2:37 AM

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I changed to string

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like it asked me to

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now my math commands are wrong ig

final crane Feb 16, 2023, 2:38 AM

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do ls

random agate Feb 16, 2023, 2:38 AM

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huh

final crane Feb 16, 2023, 2:39 AM

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actually

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can u paste all ur code here for a second

random agate Feb 16, 2023, 2:39 AM

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sure

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import java.util.Scanner;
public class ElectionStatistics{
public static void main(String[] args){
String Party1;
String Party2;
String Party3;
double Percentage1;
double Percentage2;
double Percentage3;
String Votes1;
String Votes2;
String Votes3;
int TotalVotes = 165;
int Hundred = 100;

    System.out.println("Enter name for first party >>");
    Scanner inputDevice = new Scanner (System.in);
    Party1 = inputDevice.nextLine();
    System.out.println("Enter votes received >>");
    Votes1 = inputDevice.nextLine();

    System.out.println("Enter name for second party >>");
    Party2 = inputDevice.nextLine();
    System.out.println("Enter votes received >>");
    Votes2 = inputDevice.nextLine();
    
    System.out.println("Enter name for third party >>");

    Party3 = inputDevice.nextLine();
    System.out.println("Enter votes received >>");
    Votes3 = inputDevice.nextLine();

    Percentage1 = Votes1/TotalVotes*Hundred;
    Percentage2 = Votes2/TotalVotes*Hundred;
    Percentage3 = Votes3/TotalVotes*Hundred;
    System.out.println("The" + Party1 + "got" + Percentage1 + "percent of the vote");
    System.out.println("The" + Party2 + "got" + Percentage2 + "percent of the vote");
    System.out.println("The" + Party3 + "got" + Percentage3 + "percent of the vote");
    



    
    
}

}

final crane Feb 16, 2023, 2:40 AM

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random agate

its because you are trying to divide a string

random agate Feb 16, 2023, 2:42 AM

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yes

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how to i do it then

untold apex Feb 16, 2023, 2:42 AM

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Strings are immutable

random agate Feb 16, 2023, 2:42 AM

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i need to convert it into a value first?

final crane Feb 16, 2023, 2:42 AM

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well not only that but it also makes no sense to divide a string lol

random agate Feb 16, 2023, 2:42 AM

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i input a value for votes 1

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lets say 25

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then it divides by the total number

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lets say 189

untold apex Feb 16, 2023, 2:43 AM

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use .nextInt()?

random agate Feb 16, 2023, 2:43 AM

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and multiplies by 100

final crane Feb 16, 2023, 2:43 AM

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random agate i need to convert it into a value first?

no

random agate Feb 16, 2023, 2:43 AM

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to get percent

final crane Feb 16, 2023, 2:43 AM

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you can just change its datatype to a int and do .nextInt

random agate Feb 16, 2023, 2:43 AM

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how

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can u show

final crane Feb 16, 2023, 2:43 AM

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ok

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/run java

import java.util.Scanner;

public class Example {

     public static void main(String[] args) {
          final Scanner sc = new Scanner(System.in);
          int foo;
          foo = sc.nextInt();

          System.out.println(foo);
      }

}```
5

little yokeBOT Feb 16, 2023, 2:45 AM

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Here is your java(15.0.2) output @final crane

random agate Feb 16, 2023, 2:46 AM

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but

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they are strings

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they need to be

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for me to use

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nextLine

final crane Feb 16, 2023, 2:46 AM

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why do you have to use nextLine

random agate Feb 16, 2023, 2:47 AM

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IDK you told me to...

final crane Feb 16, 2023, 2:47 AM

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yeah well you were trying to store and int in a string thats why

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nextLine returns a string

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nextInt returns a int

random agate Feb 16, 2023, 2:47 AM

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why do i need a string return

final crane Feb 16, 2023, 2:48 AM

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you dont

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thats whats causing the error

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you can just change the string to a int and do nextInt

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then you will be able to divide it

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you cant divide strings

random agate Feb 16, 2023, 2:49 AM

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were back here now

final crane Feb 16, 2023, 2:50 AM

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You are making me go insane dude

random agate Feb 16, 2023, 2:51 AM

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IM GOING INSANE

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this is due at 11:55

final crane Feb 16, 2023, 2:51 AM

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Change these datatypes to string and change the .nextInt to .nextLine

random agate Feb 16, 2023, 2:53 AM

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i understand why those are strings...

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their words

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im kinda slow

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but now

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this is happening

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it wont let me

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do the second party

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before taking me to second votes

final crane Feb 16, 2023, 2:54 AM

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After these 2 nextInt do inputDevice.nextLine()

random agate Feb 16, 2023, 2:56 AM

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alr bet it works now

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but

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the math doestn workl

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🙂

untold apex Feb 16, 2023, 2:56 AM

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harold moment

random agate Feb 16, 2023, 2:57 AM

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untold apex Feb 16, 2023, 2:58 AM

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Just a hunch

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try typecasting everything to doubles

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Hold on lemme type it out

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(double) Votes1 / (double) TotalVotes * Hundred;

final crane Feb 16, 2023, 3:00 AM

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(Votes1/TotalVotesHundred)*Hundred

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this this if that not work

untold apex Feb 16, 2023, 3:00 AM

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Oh I misread

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Honestly when I do any math involving doubles I just make sure all the variables are doubles so I don't have to worry about typecasting

random agate Feb 16, 2023, 3:03 AM

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you were absolutely right

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making them doubles worked

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untold parcel Feb 16, 2023, 3:03 AM

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you only really need one cast, usually (double) Votes1 / TotalVotes * Hundred is used
although you could just have Hundred be a double and do Votes1 * Hundred / TotalVotes, or just not use a variable for that, Votes1 * 100.0 / TotalVotes or Votes1 * 100d / TotalVotes

random agate Feb 16, 2023, 3:03 AM

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did i do anything that makes it seem like i copied code

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anything too advanced

untold parcel Feb 16, 2023, 3:03 AM

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you generally don't want to be using doubles for values that are actually integers

random agate Feb 16, 2023, 3:04 AM

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im week 3 of java basics im dying rn

untold parcel Feb 16, 2023, 3:04 AM

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(not the Hundred, since that's just conceptual, and it kinda is unnecessary as a whole tbh...)

untold apex Feb 16, 2023, 3:04 AM

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I don't think you did anything too advanced

random agate Feb 16, 2023, 3:04 AM

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alr bet

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ez 100

untold parcel Feb 16, 2023, 3:04 AM

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also btw, you should use camelCase for variables

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not PascalCase

untold apex Feb 16, 2023, 3:04 AM

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This ^^

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PascalCase for classes though

untold parcel Feb 16, 2023, 3:04 AM

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for types*

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classes, interfaces, enums, records, annotations

untold apex Feb 16, 2023, 3:05 AM

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Objects too

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ye

untold parcel Feb 16, 2023, 3:05 AM

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untold apex Objects too

no?

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objects don't get names

untold apex Feb 16, 2023, 3:05 AM

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object references?

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Oh wait

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I'm thinking of classes

untold parcel Feb 16, 2023, 3:06 AM

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object references are just integers lol

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for completeness;
java (and most other c-style languages iirc):
camelCase for variables, methods, members, functions
PascalCase for types (classes, interfaces, etc)
MACRO_CASE for conceptual constants (not equivalent to final!)

random agate Feb 16, 2023, 3:08 AM

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this discord server is hurting my braincells

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LETS GO

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so

untold parcel Feb 16, 2023, 3:09 AM

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i feel like there's a metaphor in there somewhere about improving...

random agate Feb 16, 2023, 3:09 AM

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the code

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didnt work perfectly

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becuase i realized

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the total amount of votes isnt always going to be the same

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so after Doubles Votes1/2/3 were used

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I added

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TotalVotes = Votes1/2/3 summed

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yk

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i troubleshooted my code

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for the first time

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EZ

untold apex Feb 16, 2023, 3:10 AM

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random agate this discord server is hurting my braincells

Sorry lol, I just got excited because I know way more terminology now than I did when I joined this server so now it feels like I actually know what I'm talking about 🙃

random agate Feb 16, 2023, 3:10 AM

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ik

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being a highschool freshman

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were not allowed to take college classes this advanced

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but im special

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so yk

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they let me

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which is cool and im excited so its cool to learn something

untold apex Feb 16, 2023, 3:11 AM

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Don't mean to scare you, but just wait until you get into Objects 🙃

random agate Feb 16, 2023, 3:11 AM

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no

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no

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no

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im going to drop out

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haha

untold apex Feb 16, 2023, 3:11 AM

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no don't, programming is fun

random agate Feb 16, 2023, 3:12 AM

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I want to be a software engineer

untold apex Feb 16, 2023, 3:12 AM

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Just when you pace yourself and don't let yourself get overwhelmed

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Same

random agate Feb 16, 2023, 3:12 AM

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graduate from mit or carnegie mellon

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hopefully

balmy dockBOT Feb 16, 2023, 3:12 AM

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https://dev.java/learn

untold parcel Feb 16, 2023, 3:12 AM

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seems like thisd be helpful to you

untold apex Feb 16, 2023, 3:12 AM

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Have this emoji of my Java professor

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Markou_Deprecated

random agate Feb 16, 2023, 3:15 AM

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Thank you guys bye! see yall around when I need help on this weeks assignments 🙂

#I need help