What is the correct syntax for using a variable in an ad hoc query?

Hi all
I am an occasional DB user and at the moment need to update about 1000+ records so that a certain column gets a unique value.
So I thought that I would use a variable for this.
I then built this kind of SQL statement for just a small subset of the records:
variable recNumber number;
exec :recNumber := 1;
UPDATE TABLE_TO_BE_UPD
SET COL_TO_BE_UPD = COL_TO_BE_UPD + recNumber
WHERE COL_TO_BE_UPD IN ('VAL_A','VAL_B');
I get the invalid SQL statement error when attempting to execute above (besides the prompt that asks for a value which I would like to omit).
Anyway I also tried this one:
CREATE SEQUENCE seqCounter;
UPDATE TABLE_TO_BE_UPD
SET COL_TO_BE_UPD = COL_TO_BE_UPD + seqCounter.NEXTVAL
WHERE COL_TO_BE_UPD IN ('VAL_A','VAL_B');
From this one I got the error ORA-01722: invalid number...I am guessing this comes because seqCounter is of type number and the COL_TO_BE_UPD is of type character...(?)
So what I would like to ask is what is the correct way to define and use a counter type of variable to append a number at the end of a character string?
Also another question that I would like to ask is that are variables that are used in ad hoc queries also called 'bind variables'?
Thanks muchly

If you want to append a unique number to a column then this would do it:
UPDATE TABLE_TO_BE_UPD
SET COL_TO_BE_UPD = COL_TO_BE_UPD ||to_char(rownum)
WHERE COL_TO_BE_UPD IN ('VAL_A','VAL_B');

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