print first and last digit of a number in java [2 different approaches]
In this article you can learn how to find out the first and last digit of a number in java with 2 different approaches by doing coding on mobile.
👉 You hear right, I use my android phone to write code.
Approach:-1 "find first and last digit of a number using loop in java"
public class usingLoop {
public static void main(String[] args){
//take a number
int num = 10738;
System.out.println("The number is: "+ num);
int last_digit = num % 10;
//finding first digit
int first_digit = num;
while(num >= 10)
{
num = num / 10;
first_digit = num;
}
System.out.println("First digit is: "+first_digit);
System.out.println("Last digit is: "+ last_digit);
}
}
Find last digit
Finding the last digit of a number is very easy. Just divide the given number with 10 and the remainder will be the last digit.
In java we have modulus operator to find the remainder, so easily we can find the first digit.
Find first digit
We don't have any method to access first digit of a number directly.
But we can start from the end side and eliminate digits one by one. And finally the first one can be achieved.
Here if we divide the number with 10 then results must not contain the last digit as it becomes the remainder.
So if we continuously divide the number with 10 upto last one we can easily find the first digit.
Output
Also check out:
Approach:-2 "print first and last digit of a number in java using method"
public class usingMethod {
public static void main(String[] args) {
int num = 458920;
System.out.println("The number is: "+ num);
System.out.println("First digit is: "+first_digit(num));
System.out.println("Last digit is: "+last_digit(num));
}
public static int first_digit(int num)
{
int first_digit_value = num;
while (num >= 10)
{
num = num / 10;
first_digit_value = num;
}
//System.out.println(first_digit_value);
return first_digit_value;
}
public static int last_digit(int num)
{
return num % 10;
}
}
In this approach I just use the static method to find first and last digit of a number.
Here I have created two separate method for first and last digit. Here the logic part is same.
Output
