Anonymous Block vs Procedure with Parameters

/*---------------------------------------------------*/
/* Example 1: Create an anonymous block              */
/*---------------------------------------------------*/
Declare
    vShopList Varchar2(25) := 'Apples';
Begin
    Dbms_Output.Put_Line ('Buy more '||vShopList);
End;
/
Buy more Apples

/*---------------------------------------------------*/
/* Example 2: Change to a procedure and execute      */
/*---------------------------------------------------*/
Create or Replace Procedure pShopList
is
    vShopList Varchar2(25) := 'Apples';
Begin
    Dbms_Output.Put_Line ('Buy more '||vShopList);
End;
/

Procedure created.

    /*-----------------------------------------------*/
    /* Run procedure                                 */
    /*-----------------------------------------------*/
    Begin
        pShopList;
    End;
    /
Buy more Apples

/*---------------------------------------------------*/
/* 3. Change procedure to accept parameter           */
/*---------------------------------------------------*/
Create or Replace Procedure pShopList
                                   (vShopList Varchar2)
is
Begin
    Dbms_Output.Put_Line ('Buy more '||vShopList);
End;
/

Procedure created.

    /*-----------------------------------------------*/
    /* Run procedure with input parameter            */
    /*-----------------------------------------------*/
    Begin
        pShopList ('Bananas');
    End;
    /
Buy more Bananas