CODEWITHSUNDEEP
javaarrays
Marcus Burkhart
Marcus Burkhart

Reputation: 93

Converting user input from integer to double

I am trying to ask the user to enter 4 integer values followed by 4 double values. I keep getting the error "possible lossy conversion from double to int". I have tried different things but don't understand the simple conversion. Also.. might there be a better approach to this? Any advice for me is helpful. Eventually I am going to print out the values of these down the road...

import java.util.Scanner;

public class calculations {
    public static void main(String[] args) {

       Scanner keyboard = new Scanner(System.in);

       int[] intNumbers = new int[4];

       // Prompt user to enter 4 integer values here
       System.out.println("Enter 4 integer numbers below");

       // intNumbers only excepts 4 values with the for loop
       for (int i = 0; i < 4 && keyboard.hasNextInt(); i++) {
           intNumbers[i] = keyboard.nextInt();
       }

       double[] dblNumbers = new double[4];

       // Prompt users to enter 4 double values here
       System.out.println("Enter 4 double numbers below");

       // dblNumbers only excepts 4 values with the for loop
       for (double i = 0; i < 4 && keyboard.hasNextDouble(); i++) {
           dblNumbers[i] = keyboard.nextDouble();
       }

Upvotes: 0

Views: 268

Answers (2)

Amjad Islam Khan
Amjad Islam Khan

Reputation: 33

You are using Double in your for-loop, which is not a good idea. Array indexes are always in int, so if you assign a double to it, it will give "possible loss conversion from double to int".

for (int i = 0; i < 4 && keyboard.hasNextDouble(); i++) {         
    dblNumbers[i] = keyboard.nextDouble();

Upvotes: 0

rgettman
rgettman

Reputation: 178253

You should not be using a double as an index into your array. Always use an int as an index. Change

for (double i = 0; i < 4 && keyboard.hasNextDouble(); i++) {
    dblNumbers[i] = keyboard.nextDouble();
}

to

//   vvv
for (int i = 0; i < 4 && keyboard.hasNextDouble(); i++) {
    dblNumbers[i] = keyboard.nextDouble();
}

Upvotes: 3

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