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Comments are used by a programmer as remarks on or reminders of what a particular line of code or subroutine is for. The comments are especially helpful if the program is shared among many people. When the program is compiled (made ready) for the computer or microcontroller, the comments are ignored. They only appear in the human-ready source code of your programs. To make a comment using Basic, use the ' (apostrophe) character. Any text to the right is treated as a comment and is ignored by the compiler. For example:
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' this is a comment
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Note that the symbol used for comments differs between languages. In the C programming language, for instance, the characters // are used (also /* and */ are used to mark a comment block).
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A LOOK AT COMMON PROGRAMMING STATEMENTS 87
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The If statement is used to build an if or conditional expression. It is called a conditional expression because it tests for a specific condition:
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I If the expression is True, the program performs the commands following the If state-
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I If the expression is False, the program performs the commands after the Else statement,
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if any. Here s a sample conditional statement in Basic:
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If ExampleVar = 10 Then Call (Start) Else End End If
The If statement evaluates a condition to determine if it s True or False. The most common evaluation is for equality. The (equals) sign is used to test if one value, such as the contents of a variable, is equal to another value. However, there are other forms of evaluation the If statement can use, such as not equal to, greater than, less than, and several others. See the Variables, Expressions, and Operators section later in this chapter for more information.
SELECT CASE
The Select Case statement is used when you want to test a value (usually in a variable) against several possibilities. For example, you may want to test if the contents of the MyVar variable contain the values 1, 2, 3, or 4. The Select Case statement lets you test each number individually and tell the program specifically what you want to happen should there be a match. The basic syntax for the Select Case statement is as follows:
Select Case (TestVar) Case x ' do if x Case y ' do if y Case z ' do if z End Select
TestVar is the test expression and is almost always a variable. TestVar is evaluated against each of the Case arguments that follow. If the value in TestVar is equal to x, then the program performs the action that follows Case x. If the value in TestVar is equal to y, then the program performs the action following Case y, and so forth.
88 PROGRAMMING CONCEPTS: THE FUNDAMENTALS
CALL
The Call statement tells the program to temporarily branch elsewhere in the program. This is a subroutine that is identified by name, using a label. The program expects to find a Return statement at the end of the subroutine. When it encounters the Return statement, the program jumps back to the Call statement and continues executing the rest of the program. A typical Call statement and label looks like this:
Call (Loop) ... Loop: ' stuff goes here Return ' Program goes back to the Call, and continues
The example calls the subroutine that is named Loop. After Loop is run the program goes back up to the Call statement and executes the other statements that follow it.
The Go statement is used to jump to the specified label. In programming parlance, using Go to go to a label is called unconditional branching. The Go statement uses one argument, namely, the name of the destination label. For example:
Go (Loop) ... Loop: ' stuff goes here ' Program doesn t go back to the Go
FOR/NEXT
The For/Next statement is actually a pair of commands. They repeat other programming instructions a specified number of times. The For/Next structure is perhaps the most commonly used loop. The For portion of the For/Next loop uses an expression that tells the program to count from one value to another. For each count, any programming code contained within the For/Next structure is repeated:
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