Sum of the first and last digit of a number in PL/SQL

In this problem, we are given a number n. Our task is to create a program to find the sum of the first and last digit of a number in PL/SQL.

First, let’s brush-up about PL/SQL,

PL/SQL is a combination of SQL along with the procedural features of programming languages.

Let’s take an example to understand the problem,

Input − n = 31415

Output − 8

Explanation − first digit = 3 , last digit = 5. Sum = 8

To, solve this problem, we will extract the first and last digit to number n. And the print their sum.

The first and last digits are extracted using the substr() function.

Example

Program to illustrate the working of our solution,

DECLARE
   n INTEGER := 31415;
   fistDigit INTEGER := 0;
   lastDigit INTEGER := 0;
   s INTEGER;
BEGIN
   IF a > 9 THEN
   lastDigit:= Substr(n, 1, 1);
   fistDigit := Substr(n, Length(n), 1);
   s := fistDigit + lastDigit;
   ELSE
   s := n;
   END IF;
dbms_output.Put_line('Sum of the first digit and last digit of the number is ' ||s);
END;
-- Program End

Output

Sum of the first digit and last digit of the number is 8