This simple example illustrates a few reasons why functions are a brilliant idea, and have become fundamental building blocks in many programming languages: 1  Functions enable you to reuse parts of your program. 2  Functions make understanding the program easier because they give a name and a structure to a set of instructions.
How to keep your PPL(A) Current. Once you have obtained your JAA PPL it remains valid for five years provided that you keep your medical certificate and fly enough hours each year to keep your certificate of experience current. Your certificate of experience is part of your licence and is valid for two years.
I would advise you to keep records and tax returns for the years that include out-of-the-ordinary transactions (sales or donations of property), and income from activities such as stock option exercises, trust income, etc., for six years after the filing date of the return.MoneyWatch) Most people hold on to their statements for financial, credit and utility accounts a few years, and when the pile gets too big, it's time for the shredder. 1  12 things to keep in a safe at home, not at a bank. 2  Keeping a safe deposit box safe. 3  How long to keep bank records.