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Programming Basics: Decisions and Looping
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hen writing programs, it s important to understand how programs make decisions and perform looping Looping is the process of carrying out the same set of instructions until certain conditions are met I m sure you re familiar with decisions After all, you have to make them every day For example when you wake up, which shirt do you decide to put on You make this decision based on various facts such as what the weather is like outside and what you are doing today Your life would be very dull if you never had to make any decisions think what it would be like if it was already decided what shirt you wore each day! Programs also have to make decisions based on the parameters to which they have access The computer program would also be very dull if it never made a decision For example, if a program tries to load a text file and the file is not found, a decision needs to be made as to what to do next Should the program simply display an error message and crash, or should it show some intelligence and alert the user that the file is missing and offer an alternative action Artificial intelligence is something that is frequently discussed in computing circles By having your programs make decisions, you are introducing some primitive intelligence into your program Admittedly, it is your intelligence that goes into the code, but it tells the program what to do in the event of different circumstances happening You are effectively writing a set of rules to deal with various situations Looping is also something everyone does daily without thinking about it When you eat a meal, you perform the same routine of taking food from a plate and putting it into your mouth Computer programs frequently loop around the same piece of code a number of times until a certain condition is met
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Programs, unless they are extremely simple, usually have to make decisions according to data retrieved or input from the user Decision making is one of the most important areas of programming, because it specifies what will happen when different events occur A good example of a common programming decision is IF something is true, THEN do action1, or ELSE do action2 In everyday life, this might be the statement IF it is raining, THEN carry an umbrella, or ELSE (if the condition is not met and it is not raining) carry sunglasses The following is some sample code to show how the conditional IfThenElse statement works and how it produces different results Enter this in the module you created in 2 (this must be in a module that you have inserted yourself) See Figure 4-1 for an example of what your code window should look like
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Sub Test_If() If CurrentDbName= "C:\Temp\MyDBaccdb" Then MsgBox "Database path and name are correct" Else MsgBox "Database has been re-named/moved" End If End Sub
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This example refers to the current database name in the line CurrentDbName In Access, this will give the full path and name of the Access file Run this code, replacing C:\Temp\MyDB accdb with the path and name of your own file You will get the message that the database path and name are correct Save the code and then go into Windows Explorer and make a copy of the database file Load the file in and re-run the code again in the new file and you will get the message box saying that the database has been renamed/moved You can see that a simple piece of code like this checks where the database was loaded from and checks that it has not been renamed This might seem straightforward, but there are times when the integrity of the database relies on this information being correct Notice in Figure 4-1 that I have indented the code to separate the main parts of the conditional statement this makes it easier to read and easier to debug because you can instantly see the groups of statements and where they start and finish It is possible for If statements to be nested inside each other, so you can have an If statement within an If statement; this frequently happens in more complicated programs (See the section Looping, later in this chapter, for more on how this works) It is convenient to be able to see at a glance where one If statement starts and ends If others are in between your start and stop point, you can frequently get lost when debugging code
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