Double and Int

[Kid Programmer]

Is it possible to type:

int number = scan.nextInt();
 

and not get an error if the user enters 0.0? I am trying to write a program that will average numbers until the user enters text. I want the user to be able to enter decimals as well. Here is my source:

 
import java.util.Scanner;        //import a scanner
 
public class NumberAverager {    //create a class
 
    public static void main(String[] args) {        //start the main function
        int divideby = 0, number = 0, sum = 0, average = 0;            //declare variables
        Scanner scan = new Scanner(System.in);            //create the scanner
        //explain the program
        System.out.println("This program will average WHOLE numbers.");
        System.out.println("To stop averaging numbers enter anything that is not a whole number.");
        System.out.println("Please enter the numbers: ");
        //create a loop to execute as long as the user enters numbers
        while ( scan.hasNextInt() ) {
            number = scan.nextInt();        //prompt the user for numbers
            sum = sum + number;                //add up the numbers
            divideby ++;                    //increase the amount to divide the numbers by
            if ( scan.hasNextInt() == false) {        //if the user doesn't enter a whole number
                average = sum / divideby;            //calculate the average
                //print the average
                System.out.print("The total average of the numbers is ");
                System.out.print(average);
                System.out.println(".");
            }
        }
    }
}
 

[Laharl]

No, that's a double literal. Use the Scanner's hasNext*Type* methods to determine what type the input is or parse the input as a String (scanner's next() method) and use a bunch of nested try/catch blocks to attempt different types.

As a general rule, though, just pick one of doubles or ints and use it for something like this. Any int can be represented as a double, so if you want to enable decimals, just use doubles exclusively.

[BigDaddyLH]

As a general rule, though, just pick one of doubles or ints and use it for something like this. Any int can be represented as a double, so if you want to enable decimals, just use doubles exclusively.

I agree. If the user can enter a sequence like:

2 3 5 8 13 23.3 36.6

There is no benefit in reading some of them as ints and others as doubles. Read them all in as doubles.

[Kid Programmer]

Thank you I understand :-)