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.
PP makers are keeping stable margins when feedstock gets tighter, and are keeping 1-3 cents per pound in savings when feedstock is long in order to justify reinvestment in polypropylene, added Ashish Chitalia, a market analyst with the Wood Mackenzie consulting firm in Houston.