Can anyone tell me how i might go about extracting the values from my queryresult which i store in a cursor?

Example:
i have a table with 3 data fields: a, b, c.
i execute an SQL query on above table and put the result into CURSOR called temp.

(Assume that queryresult is only a single row)
How would i retrieve individual values of a, b, and c from temp?

(Assume that queryresult is multiple rows)
How would i advance to the next row? And how can i backtrack a row?

Any help will be appreciated!
Many thanks :)

Mazlan Bin Mohammad