PL/SQL Question I need to build pl/sql block that prompts a user for the number of visitors each day for the past 5 days and then displays the average number of visitors per day.  For example;  day 1: 19 day 2: 21 day 3: 23 ... The avg number of visitors is: ___

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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PL/SQL Question

I need to build pl/sql block that prompts a user for the number of visitors each day for the past 5 days and then displays the average number of visitors per day. 

For example; 

day 1: 19

day 2: 21

day 3: 23

...

The avg number of visitors is: ___   

like this. 

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Thank you for your explanation, however, I forgot to mention that I can't use LOOP to accept new &. Instead, I should use 

DECLARE

     TYPE    my_array_type  IS TABLE OF   number INDEX BY PLS_INTEGER;

     v_n_array    my_array_type;

Then in the 'begin and end block' accept new value for each array members

begin

   v_n_array(1):= &n1

   v_n_array(2):=&n2

   ....

Collect all v_n_array members (5 different numbers) and then do calculations like finding the average.

v_avg := …………

Then Display as

DBMS_OUTPUT.PUT_LINE (The average number of visitors is: ‘ || v_avg )

END;

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