# Print all even numbers from 1 to n in PL/SQL

Prerequisite- PL/SQL Introduction

In PL/SQL code groups of commands are arranged within a block. It groups together related declarations or statements. In declare part, we declare variables and between begin and end part, we perform the operations.

Given a number N, the task is to display all the even numbers and their sum from 1 to N.

Examples:

```Input: N = 3
Output: 2
Sum = 2

Input: N = 5
Output: 2, 4
Sum = 6
```

Approach is to initialize a number num with 2 and keep incrementing it by 2 until num is <= N.
Below is its implementation:

 `-- Display all even number from 1 to n ` `DECLARE` `    ``-- Declare variable num ` `    ``num NUMBER(3) := 2; ` `    ``sum1 NUMBER(4) := 0; ` `BEGIN` `    ``WHILE num <= 5 LOOP ` ` `  `        ``-- Display even number ` `        ``dbms_output.Put_line(num); ` ` `  `        ``-- Sum of even numbers ` `        ``sum1 := sum1 + num; ` ` `  `        ``-- Next even number ` `        ``num := num + 2; ` `         `  ` `  `    ``-- End  loop ` `    ``END` `LOOP; ` ` `  `    ``-- Display even number ` `        ``dbms_output.Put_line(``'Sum of even numbers is '` `|| sum1); ` `END``; `

Output:

```2
4
Sum of even numbers is 6
```

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