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VISUAL BASIC FUNDAMENTALS
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EXAMPLE 2.20
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Suppose we wanted to calculate the square root of the value represented by the expression Area / 3.141593, using the library function Sqr. To do so, we could write
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Radius = Sqr(Area / 3.141593)
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Notice that the argument of Sqr is the numeric expression (Area / 3.141593). Of course, we could also have written
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Radius = (Area / 3.141593) ^ 0.5
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The library function is not required in this situation it is merely used for convenience. In many situations, however (such as calculating the log of a number, or calculating the length of a string), the use of library functions may be the only straightforward way to carry out the calculation.
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Most of the functions listed in Table 2.1 have a straightforward interpretation. A few, however, require some additional explanation. The next several examples should clarify any confusion. EXAMPLE 2.21
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The Int function can be confusing, particularly with negative arguments. The values resulting from several typical function calls are shown below.
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Int(2.3) = 2 Int(2.7) = 2 Int( 2.3) = 3 Int( 2.7) = 3
Remember that Int produces a value whose magnitude is equal to or smaller than its argument if the argument is positive, and equal to or larger (in magnitude) than its argument if the argument is negative.
Some functions, such as Log and Sqr, require positive arguments. If a negative argument is supplied, an error message will be generated when an attempt is made to evaluate the function.
EXAMPLE 2.22
A Visual Basic program contains the statements
x = 2.7 . . . . . y = Sqr(x)
(Notice the negative value assigned to x.)
When the program is executed, the following error message will be displayed:
Run-time error '5': Invalid procedure call or argument
The execution will then cease. Similarly, the statement
y Log(x)
will produce the same error message when the program is executed.
CHAP. 2]
VISUAL BASIC FUNDAMENTALS
EXAMPLE 2.23
The Format function allows a data item to be displayed in many different forms. Several possibilities are shown below. Many other variations are possible. Expression
Print Format(17.66698, ##.## ) Print Format(7.66698, ##.## ) Print Format(0.66667, ##.### ) Print Format(0.66667, #0.### ) Print Format(12345, ##,### ) Print Format(12345, ##,###.00 ) Print Format( Basic , &&&&&&&& ) Print Format( Basic , @@@@@@@@ ) Print Format(Now, mm-dd-yyyy ) Print Format(Now, mm/dd/yy )
Result
17.67 7.67 .667 0.667 12,345 12,345.00 Basic
(note the leading blank space) (note the leading blank spaces) (note the leading blank space)
Print Format(Now, hh:mm:ss am/pm )
The use of library functions is not confined to assignment statements a library function may appear anywhere in an expression in place of a constant or a variable. Moreover, the arguments need not be constants or simple variables expressions (which may include references to other functions) can be used as valid function arguments, provided they are of the proper data type. We will encounter additional library functions elsewhere in this book, in conjunction with features to be discussed in later chapters.
2.13 PROGRAM COMMENTS Comments provide a convenient means to document a program (i.e., to provide a program heading, to identify important variables, to distinguish between major logical segments of a program, to explain complicated logic, etc.). A comment consists of a single apostrophe ('), followed by a textual message. Comments can be inserted anywhere in a Visual Basic program. They have no effect on the program execution.
EXAMPLE 2.24
A Visual Basic program includes the following statements:
'Program to Calculate the Roots of a Quadratic Equation . . . . . X1 = ( b + root) / (2 * a) 'calculate the first root X2 = ( b root) / (2 * a) 'calculate the second root Print X1, X2
The entire first line is a comment, which serves as a program heading. On the other hand, the last two lines each have a comment attached at the end of an executable statement. Note that each comment begins with a single apostrophe.
Note that Now is a predefined Visual Basic variable that represents the current date and time, as determined by the computer s real-time clock.
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