Adoquery: output parameters used to execute the Stored Procedure

Adoquery: output parameters used to execute the Stored Procedure

I wrote this for self-check in the future. Oh, of course, no one else can check it.
Step 1: Establish proc
Create proc myabc @ A int, @ B INT, @ C int output
As
Set @ C = @ A * @ B

Run the following command in SQL:

Declare @ A int, @ B INT, @ C int
Set @ A = 250
Set @ B = 40
Exec myabc @ A, @ B, @ C output -- add the output keyword!
Select @ C

In D:

Adoquery1.close;
Adoquery1. SQL. Clear;
Adoquery1. SQL. Add ('execute myabc: A,: B,: C output'); // you must also add the output keyword!
Adoquery1.parameters. parambyname ('A'). Value: = 250;
Adoquery1.parameters. parambyname ('B'). Value: = 40;
Adoquery1.execsql;
Showmessage (adoquery1.parameters. parambyname ('C'). value );