Need help with variable declaration | Together Java | Page 1

errant oreBOT Dec 18, 2022, 9:08 AM

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<@&987246399047479336> please have a look, thanks.

errant oreBOT Dec 18, 2022, 9:09 AM

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errant ore <@&987246399047479336> please have a look, thanks.

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proud latch Dec 18, 2022, 9:20 AM

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might want to have 2 fields for the age, one for the year count and one for the month count

uneven blade Dec 18, 2022, 9:21 AM

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proud latch might want to have 2 fields for the age, one for the year count and one for the ...

Oh yeah i forgot to mention that my instructor wants us to create only one variable for the age

proud latch Dec 18, 2022, 9:23 AM

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You can store the age as a float representing years. So if an kid is 1.5 years old, that’s 1 year and 6 months

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So to get the 1 part (the year part), simply cast the float to an int. It will remove the decimals. So (int) age

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For the months, let’s think about it.
One year is 12 months. So if you have the age, what happens when you multiply it by 12?
1 year -> 1*12 = 12
1.5 years -> 1.5*12 = 18
Etc etc. so multiplying the age gives you the amount of months

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This isn’t quite what you want yet though

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Because 1.5 should be “1 year and 6 months”, not 18 months

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For this we can use the modulo operator %

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Since 18%12 = 6. 6 months. % is the remainder of the division operation (18/12 is 1 remainder 6

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So to isolate the years you can do (int) age. To isolate the months you can multiply by 12 and use the modulo operator. Keep in mind the modulo operator only works on ints, so we will cast 1 more time to get:
(int) (age*12)%12

uneven blade Dec 18, 2022, 9:55 AM

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public class MainCats {
    public static void main(String args[])
    {
        Cats cats[] = new Cats [5];
       
        cats[0] = new Cats("Diego",2);
        cats[1] = new Cats("Dora", 1.5f);
        cats[2] = new Cats("Didi", 1);
        cats[3] = new Cats("Digimon",8);
        cats[4] = new Cats("Doraemon",5);

        System.out.println("---CATS INFORMATION---");

        for(int i = 0; i<5;i++)
        {
            cats[i].DisplayCats();
        }
    }
}

errant oreBOT Dec 18, 2022, 9:55 AM

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uneven blade ``` public class MainCats { public static void main(String args[]) { ...

Detected code, here are some useful tools:

Formatted code

public class MainCats {
  public static void main(String args[] ) {
    Cats cats[]  = new Cats[5] ;
    cats[0]  = new Cats("Diego", 2);
    cats[1]  = new Cats("Dora", 1.5f);
    cats[2]  = new Cats("Didi", 1);
    cats[3]  = new Cats("Digimon", 8);
    cats[4]  = new Cats("Doraemon", 5);
    System.out.println("---CATS INFORMATION---");
    for (int i = 0; i < 5; i++) {
      cats[i] .DisplayCats();
    }
  }
}

uneven blade Dec 18, 2022, 9:55 AM

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errant ore Detected code, here are some useful tools:

my main class

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The inputCats method can only receive String name and variable age. That's it

proud latch Dec 18, 2022, 11:13 AM

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By 0 output you mean nothing is output to the console?

proud latch Dec 18, 2022, 11:14 AM

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uneven blade Oh yeah i forgot to mention that my instructor wants us to create only one varia...

You’ve created 2 fields in this class for age. If you only need one, only have 1 field for age, then you can either have a separate method to calculate the years/month by getYears() or something, or do that logic in your display function

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Also your class should be called Cat as an object of that class is a cat, not multiple cats

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Also variables and methods should start with lowercases

uneven blade Dec 18, 2022, 11:20 AM

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proud latch You’ve created 2 fields in this class for age. If you only need one, only have 1...

public class Cats {
    private String name;
    private double ageYears;


    public void InputCats(String name, double age) {
        this.name = name;
        this.ageYears = (int)age;
    }

    public void DisplayCats() {
        System.out.println("Cat name : " + name);
        System.out.println("Cat age : " + (int)ageYears + "Years "+ (int)(ageYears*12)%12 + "Months");
    }

   Cats(String name, double age)
    {
        InputCats( name, age);
    }
}

errant oreBOT Dec 18, 2022, 11:20 AM

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uneven blade ``` public class Cats { private String name; private double ageYears; ...

Detected code, here are some useful tools:

Formatted code

public class Cats {
  private String name;
  private double ageYears;
  public void InputCats(String name, double age) {
    this .name = name;
    this .ageYears = (int ) age;
  }
  public void DisplayCats() {
    System.out.println("Cat name : " + name);
    System.out.println("Cat age : " + (int ) ageYears + "Years " + (int ) (ageYears * 12) % 12 + "Months");
  }
  Cats(String name, double age) {
    InputCats(name, age);
  }
}

uneven blade Dec 18, 2022, 11:21 AM

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errant ore Detected code, here are some useful tools:

this is my latest code

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this is the output. I'm getting 0 for Didi. Didi should be 1 years and 6 months old

proud latch Dec 18, 2022, 11:22 AM

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You want to store the age as a float or a double. Then, when you want to get the years/months out of it, you can do what we talked about before with casting to get the years and % to get the months

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Right now you’re casting go an int right away, stripping away the decimals

uneven blade Dec 18, 2022, 11:24 AM

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public class Cats {
    private String name;
    private int ageYears;


    public void InputCats(String name, double age) {
        this.name = name;
        this.ageYears = (int)age;
    }

    public void DisplayCats() {
        System.out.println("Cat name : " + name);
        System.out.println("Cat age : " + (int)ageYears + "Years "+ (int)(ageYears*12)%12 + " Months");
    }

   Cats(String name, double age)
    {
        InputCats( name, age);
    }
}

errant oreBOT Dec 18, 2022, 11:24 AM

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uneven blade ``` public class Cats { private String name; private int ageYears; ...

Detected code, here are some useful tools:

Formatted code

public class Cats {
  private String name;
  private int ageYears;
  public void InputCats(String name, double age) {
    this .name = name;
    this .ageYears = (int ) age;
  }
  public void DisplayCats() {
    System.out.println("Cat name : " + name);
    System.out.println("Cat age : " + (int ) ageYears + "Years " + (int ) (ageYears * 12) % 12 + " Months");
  }
  Cats(String name, double age) {
    InputCats(name, age);
  }
}

uneven blade Dec 18, 2022, 11:24 AM

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errant ore Detected code, here are some useful tools:

changed age to int

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still getting the same output

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Dora should be 1 years and 6 months old

proud latch Dec 18, 2022, 11:28 AM

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uneven blade changed age to int

Well that’s not going to work, is it? If someone is 1 year and 6 months old, that’s 1.5 years. You can’t have an int with the value of 1.5

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So the age of a can’t should be a floating point number, so either a float or a double

uneven blade Dec 18, 2022, 11:31 AM

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changed it to float and still gives me 0 months

proud latch Dec 18, 2022, 11:31 AM

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Can I see?

uneven blade Dec 18, 2022, 11:32 AM

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public class Cats {
private String name;
private double ageYears;

public void InputCats(String name, double age) {
    this.name = name;
    this.ageYears = (int)age;
}

public void DisplayCats() {
    System.out.println("Cat name : " + name);
    System.out.println("Cat age : " + (int)ageYears + "Years "+ (int)(ageYears*12)%12 + " Months\n");
}

Cats(String name, double age)
{
InputCats( name, age);
}
}

modest canyon Dec 18, 2022, 11:34 AM

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ur code is unreadable without syntax highlighting

errant oreBOT Dec 18, 2022, 11:34 AM

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uneven blade public class Cats { private String name; private double ageYears; ...

Detected code, here are some useful tools:

Formatted code

public class Cats {
  private String name;
  private double ageYears;
  public void InputCats(String name, double age) {
    this .name = name;
    this .ageYears = (int ) age;
  }
  public void DisplayCats() {
    System.out.println("Cat name : " + name);
    System.out.println("Cat age : " + (int ) ageYears + "Years " + (int ) (ageYears * 12) % 12 + " Months\n");
  }
  Cats(String name, double age) {
    InputCats(name, age);
  }
}

uneven blade Dec 18, 2022, 11:35 AM

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modest canyon ur code is unreadable without syntax highlighting

oops sorry

proud latch Dec 18, 2022, 11:35 AM

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uneven blade public class Cats { private String name; private double ageYears; ...

You are doing (int) in your constructor

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So you’re turning it into an int

uneven blade Dec 18, 2022, 11:36 AM

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WHOAAAAAA

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URE FREAKING AMAZING MAN!!!

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THANK YOU KIND SIR!

proud latch Dec 18, 2022, 11:38 AM

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🙏🏼

#Need help with variable declaration