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.
Q is the total product, or output. Output depends on capital and labor. Holding one input constant. MPL = change in Q/ change in L â holding labor constant. Assuming a price of $2 per unit in a perfectly competitive product market.