Sum of First and Last Digit of a Number in Java Language

Sum of First and Last Digit of a Number in Java Language – Java program to find the sum of digits of the given number. Now in this post, we will write a Java program to find the sum of the first and last digit of a number.

• Example:-
• Number = 12345
• The first digit = 1, last digit = 5
• Sum of first and last digits = 1 + 5 = 6

Procedure to find the sum of first and last digit of a number in java,

• Take a number
• Declare sum variable and initialize it with 0
• Find the last digit. To find the last digit we can use % operator. The expression number%10 gives the last digit of the number.
• Find the first digit of the number. For this
• Find the total number of digits in the given number.
• Divide the number by 10^(total_number_of_digits-1), it will give the first digit of the number.
• Add first and the last digit to the sum variable.

Program to find Sum of First and Last Digit of a Number in Java

import java.util.Scanner;

public class SumOfFirstAndLastDigitProgram {

  // method to find sum of first and last digit
  private static int FirstLastDigitSum(int number) {

     // declare variables
     int lastDigit, firstDigit, divisor;;
     int totalDigits = 0;
     int sum = 0;

     // find last digit
     lastDigit = number%10;

     // find total number of digits
     totalDigits = findDigits(number);

     // calculate divisor value
     divisor = (int)Math.pow(10, totalDigits-1);

     // find first digit
     firstDigit = number / divisor;

     // add values
     sum = firstDigit + lastDigit;

     return sum;
  }

  // method to find total number of digits
  private static int findDigits(int number) {
     int count = 0;
     while(number!=0) {
        count++;
        number = number/10;
     }
     return count;
  }

  public static void main(String[] args) {

     // declare variables
     int number = 0;
     int sum = 0;

     // create Scanner class object 
     // for reading the values
     Scanner scan =  new Scanner(System.in);

     // read input
     System.out.print("Enter an integer number:: ");
     number = scan.nextInt();

     // find sum of digits of number
     sum = FirstLastDigitSum(number);

     // display result
     System.out.println("The sum of first & last"
            +" digit of the number "+number
            +" = "+ sum);

     // close Scanner class object
     scan.close();
  }
}

OUTPUT

Enter an integer number:: 213457
The sum of first & last digit of the number 213457 = 9

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