SELECT CASE variable CASE value1 Command CASE value2 Command CASE value3 Command END SELECT in Java

Making QR Code ISO/IEC18004 in Java SELECT CASE variable CASE value1 Command CASE value2 Command CASE value3 Command END SELECT

The preceding SELECT-CASE is equivalent to the following IF-THEN-ELSEIF statement:

IF variable = value1 THEN Command ELSEIF variable = value2 THEN Command ELSEIF variable = value3 THEN Command END IF

To check if a variable matches multiple values, you can separate multiple values with commas or use the TO keyword to match a range of values, such as

The preceding SELECT-CASE is equivalent to the following IF-THEN-ELSEIF statement:

IF variable = value1 OR variable = value2 OR variable = value3 THEN Command ELSEIF variable >= value4 AND variable <= value10 THEN Command END IF

Besides checking for exact values, the SELECT CASE statement can also compare values with the <, <=, >, or >= comparison operators, such as

When the SELECT-CASE statement uses comparison operators, it uses the IS keyword The preceding SELECT-CASE statement is equivalent to

A looping statement repeats one or more commands for a fixed number of times or until a certain Boolean condition becomes True To create a loop that repeats for a fixed number of times, use the FOR-NEXT loop, which looks like this:

If you wanted the FOR-NEXT loop to run five times, you d set the Start value to 1 and the End value to 5, such as

Normally the FOR-NEXT loop counts by one, but you can use the STEP keyword to make the FOR-NEXT loop count by any value, such as by three, as shown in this example:

Rather than count up, the FOR-NEXT loop can also count down In Visual Basic, you can count down by using a negative number after the STEP keywords, such as

If you don t know how many times you need to repeat commands, use a DO loop The two variations of a DO loop are DO-UNTIL and DO-WHILE (available only in Visual Basic)

The DO-UNTIL loop repeats until a certain condition becomes True The DO-WHILE loop repeats while a certain condition remains True The two variations of the DO-UNTIL loop look like this:

In this version, the DO-UNTIL loop checks if a condition is True If so, this loop never runs If not, this loop runs at least once The second variation of the DO-UNTIL loop looks like this:

This loop runs at least once before checking a condition If the condition is True, the loop stops The DO-WHILE loops work nearly identically If you want to make a loop that may run zero or more times, you d use this DOWHILE loop:

If you want a DO-WHILE loop that runs at least once, you d use this variation:

Although REALbasic lacks the DO-WHILE loop, it does offer a WHILE-WEND loop, which looks like this:

You can create a subprogram (or a procedure) by using the SUB keyword as follows:

Every subprogram must have a unique name, which usually describes the purpose of that subprogram, such as Calculate_Velocity or CheckPassword The parameter list declares variables to hold any data the subprogram may need from another part of the program For example, a simple parameter list might look like this:

The BYVAL keyword stands for By Value and means that the subprogram receives a copy of data sent to it from another part of the program If the subprogram changes the value of that data, the new value of that data only appears in the subprogram and not in any other part of the program The BYVAL keyword is optional in REALbasic Instead of the BYVAL keyword, you could also use the BYREF keyword, which stands for By Reference, such as

When accepting data By Reference, a subprogram can change the value of that data, which can affect the rest of the program A function is a special version of a subprogram that always returns a single value To create a function, use the FUNCTION keyword, such as