Sophomore Java Homework-P5.3

/**
 * Name: Method practice - firstDigit(), lastDigit(), digits().
 * @author LinChuWen
 * Date: 2014.10.21
 *
 * NCHU EE,course number:2335
 * course name: Object Oriented Language
 * Textbook: Big Java:Late Objects-Cay S. Horstmann
 * Problem: P5.3
 * Description: Enter an integer, then print out the first digit, the last digit, and the length of input number.
 */
import java.util.*;
public class HW4_P5_3 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.print("Please enter an integer: ");
        while(input.hasNext()){
            int n = input.nextInt();

            System.out.printf("firstDigit(%d)=%d\n", n, firstDigit(n));
            System.out.printf("lastDigit(%d)=%d\n", n, lastDigit(n));
            System.out.printf("digits(%d)=%d\n\n", n, digits(n));
            System.out.print("Please enter an integer: ");
        } //while end

        input.close();
    } //main end

    private static int firstDigit( int number ){
        while(number >= 10)
            number/=10;
        int firstDigit=number;
        return firstDigit;
    } //firstDigit() end

    private static int lastDigit( int number ){
        int lastDigit=number%10;
        return lastDigit;
    } //lastDigit() end

    private static int digits( int number ){
        int digits=0;
        while(number > 0){
            number/=10;
            digits++;
        }
        return digits;
    } //digits() end

} //class end