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.
What Personal Documents Should You Keep and for How Long? Keep until warranty expires or can no longer return or exchange. Sales Receipts (Unless needed for tax purposes and then keep for 3 years) What to keep for 1 month. ATM Printouts (When you balance your checkbook each month throw out the ATM receipts) What to keep for 1 year