Storing doubles in an array
Ok, so I want to store the 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();
}
}
Problem # 1: They tell me what it mylist = bob.nextDouble()
should be nextLine()
. Why is this if it is clearly double?
Purpose. I want to somehow store these values given in an array so that I can then pull them out. Can anyone please help?
UPDATE
In issue # 1, he informs me that he cannot convert from Double()
to Double[]
. What does it mean?
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mylist
is array
twins, not one double
.
When you do mylist = bob.nextDouble();
, you are basically trying to make the entire array equal to one number.
Instead, you need to assign a number to a specific location in the array.
-
Initialize the array with the number of elements you intend to store in the array:
double[] mylist = new double[2];
-
Assign a double to a specific location in the array:
mylist[0] = bob.nextDouble(); mylist[1] = bob.nextDouble();
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The error is when you are trying to assign a double value to an array in the following expression:
mylist = bob.nextDouble();
since mylist is defined as an array here:
double[] mylist;
First you need to inject your array:
double[] mylist = new double[2]; // initialise array to have two elements
and then try to assign the elements of the array with user input like this:
mylist[0] = bob.nextDouble(); mylist[1] = bob.nextDouble();
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It is an array (which is the type of object). First, create an array large enough to hold double
(s) (not int
(s)). And store the values at the 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));
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The array is not double, you need to select the 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 the array in a list, use CamelCase to name your variables / methods / classes and initialize the array. I recommend that you read the Java tutorial for working with the basics of the language.
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