Java Program to find First and Last Digit of a Number

Write a Java Program to find First and Last Digit of a Number with an example. This program allows the user to enter any value. Next, this program finds and returns the First and Last Digits of the user-entered number.

import java.util.Scanner;

public class FirstandLastDigit1 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int number, first_digit, last_digit;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter any Number that you wish : ");
		number = sc.nextInt();	
		
		first_digit = number;
		while(first_digit >= 10)
		{
			first_digit = first_digit / 10;
		}	
		
		last_digit = number % 10;
		
		System.out.println("\n The First Digit of a Given Number " + number + "  =  " + first_digit);
		System.out.println("\n The Last Digit of a Given Number " + number + "  =  " + last_digit);
	}
}

Number = 2356

While Loop First Iteration while (2356 >= 10)
first_digit = first_digit / 10 = 2356 / 10 = 235

Second Iteration while (235 >= 10)
first_digit = 235 / 10 = 23

Third Iteration while (23 >= 10)
first_digit = 23 / 10 = 5

Fourth Iteration while (5 >= 10)
Condition is False. So, the Java compiler exits from the While Loop
first_digit = 5

last_digit = 2356 % 10
last_digit = 6

Java Program to find First and Last Digit of a Number Example 2

This program is the same as the above first and last digit example. But in this program, we are creating two separate methods to find the first and last Digit of the user-entered value. We have previously demonstrated this in our earlier articles. So, Please refer First Digit and Last Digit article.

import java.util.Scanner;

public class FirstandLastDigit2 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int number, first_digit, last_digit;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter any Number that you wish : ");
		number = sc.nextInt();	
		first_digit = firstDigit(number);
		
		last_digit = lastDigit(number);
		
		System.out.println("\n The First Digit of a Given Number " + number + "  =  " + first_digit);	
		System.out.println("\n The Last Digit of a Given Number " + number + "  =  " + last_digit);
	}
	
	public static int firstDigit(int num)
	{
		while(num >= 10)
		{
			num = num / 10;
		}	
		return num;	
	}
	
	public static int lastDigit(int num)
	{
		return num % 10;	
	}
}

First and Last Digit in a Number output.

 Please Enter any Number that you wish : 789625

 The First Digit of a Given Number 789625  =  7

 The Last Digit of a Given Number 789625  =  5