# Print all odd numbers and their sum from 1 to n in PL/SQL

Prerequisite PL/SQL introduction
In PL/SQL code groups of commands are arranged within a block. A block group 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 odd numbers from 1 to N and their sum.

Examples:

```Input: 3
Output: 1, 3

Input: 5
Output: 1, 3, 5
```

Approach is to initialize a num with 1 and sum with 0 and keep incrementing num by 2 and sum by num until num <= N.

 `-- display all odd number from 1 to n ` `DECLARE` `    ``-- declare variable num ` `    ``num NUMBER(3) := 1; ` `    ``sum1 NUMBER(4) := 0; ` `BEGIN` `    ``WHILE num <= 5 LOOP ` `        ``-- display odd number ` `        ``dbms_output.Put_line(num); ` ` `  `        ``-- the sum of all odd numbers ` `         ``sum1 := sum1 + num; ` ` `  `        ``--next odd number ` `        ``num := num + 2; ` ` `  `    ``-- end  loop ` `    ``END` `LOOP; ` `dbms_output.Put_line(``'Sum of all odd numbers is '``|| sum1); ` `END``;   `

Output:

```1
3
5
Sum of all odd numbers is 9
```

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