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# Sum and average of three numbers 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 three numbers and the task is to find out the sum and average of three numbers.
Examples:

```Input: a = 12, b = 15, c = 32
Output: sum = 59 avg = 19.66

Input: a = 34, b = 45, c = 11
Output: sum = 90 avg = 30
```

Approach is to take three numbers and find their sum and average using the formula given below-
Sum: Average: Where a,b,c are the three numbers.

Below is the required implementation:

 `--To find sum and avg of three numbers  ` `DECLARE`  ` `  `    ``-- Assigning 12 into a  ` `    ``a     NUMBER := 12;  ` `     `  `    ``-- Assigning 14 into b  ` `    ``b     NUMBER := 14;  ` `     `  `    ``-- Assigning 20 into c  ` `    ``c     NUMBER := 20;  ` `     `  `    ``-- Declare variable for sum   ` `    ``-- Of Three number (a, b, c)  ` `    ``sumOf3 NUMBER;  ` `     `  `    ``-- Declare variable for average  ` `    ``avgOf3 NUMBER;  ` `     `  `--Start Block  ` `BEGIN`  ` `  `    ``-- Assigning sum of a, b and c into sumOf3  ` `    ``sumOf3 := a + b + c;  ` ` `  `    ``-- Assigning average  of a, b and c into avgOf3  ` `    ``avgOf3 := sumOf3 / 3;  ` ` `  `    ``--print Result  sum of a, b, c number  ` `    ``dbms_output.Put_line(``'Sum = '`  `                         ``||sumOf3);  ` ` `  `    ``--print Average  sum of a, b, c number  ` `    ``dbms_output.Put_line(``'Average = '`  `                         ``||avgOf3);  ` `END``;  ` ` `  `--End Program  `

Output:

```Sum = 46
Average = 15.33
```

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