CODEWITHSUNDEEP
javaarrays
Code123
Code123

Reputation: 345

Storing doubles in an array

Alright, so I want to store values in an array. Here is my code :

import java.util.Scanner;
public class test {
    public static void main(String args[]){
        Scanner bob = new Scanner(System.in);

        double[] mylist;

        System.out.println("What is your first value?");
        mylist = bob.nextDouble();

        System.out.println("What is your second value?");
        mylist = bob.nextDouble();
    }
}

Issue #1: I'm being told mylist = bob.nextDouble() should be nextLine(). Why is that if it is clearly a double?

Goal: I want to somehow store those values given into an array so that I could later pull them out. Can anyone help?

UPDATE

For Issue #1, it tells me that it cannot convert from Double() to Double[]. What does this mean?

Upvotes: 3

Views: 45411

Answers (5)

Samrat Dutta
Samrat Dutta

Reputation: 1737

Better still, use a list with generics.

List<Double> myList;

myList.add(bob.nextDouble());

That way, you can add as many doubles you want to the list. So that you dont have to worry about the indexing.

Upvotes: 0

Juned Ahsan
Juned Ahsan

Reputation: 68715

The error is because you are trying to assign a double value to array in the following statement:

    mylist = bob.nextDouble();

as mylist is defined as an array here:

    double[] mylist;

First you need to intialize your array:

    double[] mylist = new double[2]; // initialise array to have two elements

and then try to assign the array elements with the user input like this:

    mylist[0] = bob.nextDouble();
    mylist[1] = bob.nextDouble();

Upvotes: 5

Tot Zam
Tot Zam

Reputation: 8746

mylist is an array of doubles, not a single double.

When you do mylist = bob.nextDouble(); you are basically trying to make an entire array equal a single number.

You instead need to assign the number to a specific place in the array.

  1. Initialize the array with the amount of elements you are going to store in the array:

    double[] mylist = new double[2];

  2. Assign the double to a specific place in the array:

    mylist[0] = bob.nextDouble();
mylist[1] = bob.nextDouble();

Upvotes: 3

Dici
Dici

Reputation: 25960

An array is not a double, you need to select an index :

double[] arr = new double[2];
System.out.println("What is your first value?");
arr[0] = bob.nextDouble();

System.out.println("What is your second value?");
arr[1] = bob.nextDouble();

Also, don't call an array a list, use CamelCase for naming your variables/methods/classes, and initialize the array. I recommend you reading a Java tutorial for working on the basics of the language.

Upvotes: 3

Elliott Frisch
Elliott Frisch

Reputation: 201467

It's an array (which is a type of object). First, create an array large enough to store your double(s) (not int(s)). And store the values at appropriate indices. Something like,

Scanner bob = new Scanner(System.in);
double[] mylist = new double[2];
System.out.println("What is your first value?");
mylist[0] = bob.nextDouble();
System.out.println("What is your second value?");
mylist[1] = bob.nextDouble();
System.out.println(Arrays.toString(mylist));

Upvotes: 3

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