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 to keep for 1 year. 1  Paycheck Stubs (You can get rid of once you have compared to your W2 & annual social security statement) 2  Utility Bills (You can throw out after one year, unless you're using these as a deduction like a home office --then you need to keep them for 3 years after you've filed that tax return) Cancelled Checks (Unless needed for tax purposes and then you need to keep for 3 years) Credit Card Receipts (Unless needed for tax purposes and then you need to keep for 3 years) Bank Statements (Unless needed for tax purposes and then you need to keep for 3 years) Quarterly Investment Statements (Hold on to until you get your annual statement) What to keep for 3 years