Question

I was wondering how to get a Scanner to set its value to an integer.

The reason I want to do this is because I have my program:

• reading a line of input that is only numbers,
• then takes the input, puts it into an int,
• and then uses the Integer.toBinaryString(<name of int>); to show the number in binary

The only problem is that the name of in HAS to be an int; it can’t be a String.

Here’s my code if you need it:

package base.pkg10.to.binary.txt.converter;

import java.util.Scanner;
import static java.lang.System.out;

public class Base10ToBinaryTXTConverter {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        int output;

        out.println("This converts base 10 numbers to binary numbers.");
        out.println("Please enter your Base 10 Number:");
        out.println("Please wait...");
        out.println("Your numeber in Binary is:");
        out.println(Integer.toBinaryString(input));

    }
}

Answer 1

So, you need to convert the input from the scanner to an integer?

Try:

int result = Integer.parseInt(input.nextLine());

Then you could write:

out.println(Integer.toBinaryString(result));

Edit: When using Integer.parseInt, it is a good idea to catch any NumberFormatExceptions that may arise from invalid input, e.g. Integer.parseInt("foo"); will throw such an exception.