Number Parser

Homework EXercise 2
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import java.util.Scanner;

public class NumberParser {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        char a, b, c; // Variables for holding the digits as characters
        int n1, n2, n3; // int variables for holding the digits and calculating the desired number
        System.out.print("Please enter 3 digits between 0 and 9: ");
        a = s.next().charAt(0);
        b = s.next().charAt(0);
        c = s.next().charAt(0);
        n1 = a - '0';
        n2 = b - '0';
        n3 = c - '0';
        // Validating the input characters. If the input is not a number character the system will print an error message
        if((n1 > 9 || n1 < 0 ) || (n2 > 9 || n2 < 0 ) || (n3 > 9 || n3 < 0 )) {
            System.out.println("Bad input!!");
        } else {
            // Calculating the number and printing it to the console
            System.out.println("The number is: " + (n1 + n2*10 + n3*100));
        }
    }
}