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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