barcode reader project in asp.net MACRO DEVELOPMENT in Software

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MACRO DEVELOPMENT
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TABLE 10.2 COMBINED ASSIGNMENT OPERATORS AVAILABLE TO THE ASSEMBLER CALCULATOR OPERATOR EQUIVALENT OPERATION
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+= = *= /= %= <<= >>= &= != ^=
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Parm1 = Parm1 + Parm2 Parm1 = Parm1 Parm2 Parm1 = Parm1 * Parm2 Parm1 = Parm1 / Parm2 Parm1 = Parm1 % Parm2 Parm1 = Parm1 << Parm2 Parm1 = Parm1 >> Parm2 Parm1 = Parm1 & Parm2 Parm1 = Parm1 ! Parm2 Parm1 = Parm1 ^ Parm2
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TABLE 10.3 COMPARISON OPERATORS AVAILABLE TO THE ASSEMBLER CALCULATOR OPERATOR OPERATION
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== != > >= < <= || && !
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Return 1 if two parameters are equal Return 1 if two parameters are different Return 1 if the rst parameter is greater than the second parameter Return 1 if the rst parameter is greater than or equal to the second parameter Return 1 if the rst parameter is less than the second parameter Return 1 if the rst parameter is less than or equal to the second parameter Return 1 if either of the two parameters is not zero Return 1 only if both of the two parameters are not zero Toggle the logical value of a single parameter
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MULTILINE C MACROS
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will be loaded with 1 because 7 and 5 are not 0, and both are assumed to be true. This operation of logical values is not unique to the MPASM assembler calculator; most languages use this convention for true and false. The last operator is !, which toggles the logical state of a value, for example,
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A = !4 ; ; ; ; ; ; ; ; 4 != 0 and is true A = not true = false = 0 0 == 0 and is false C = not false = true = 1
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C = !0
The comparison and logical operators may seem unnecessary for arithmetic calculations, but there are cases where they can be useful.
Multiline C Macros
If you are a new C language programmer, you might be wondering how to implement macros similar to the ones shown in this chapter. Macros are not only for assembly language they can be used effectively for high level languages as well. If you are learning to program in C, you may have noticed that there isn t a macro directive as there is in assembly language, but you can use de nes as macros, and using C s ability to concatenate the text on the next line to the current line, you can produce your own multiline macros. The #de ne directive in C is similar to the de ne directive in assembly language; when it is encountered, it replaces the label with the string following the de ne and replaces any parameters with the arguments of the de ne. For example, if you had a circular buffer 20 entries in size and you wanted to increment the indexes to the buffer, you could use the code
buf ndex++; if (19 < buf ndex) buf ndex = 0; // // Increment the buffer index If the index is 20 or greater, reset
If the code were used often and for different index variables, you might want to consider turning it into a single line of code and using it as the basis for a de ne. If you are familiar with C, you would know that you could reduce the three lines above to the single line
if (19 < ++buf ndex) buf ndex = 0; // keep ++index in buffer range
Despite being dif cult to read, this single line will increment buf ndex and ensure that it is within range for the 20-element circular buffer. The line then could be turned
MACRO DEVELOPMENT
into the de ne (which can be used as a macro within C):
#de ne buf nc(indexvar) if (19 < ++indexvar) indexvar = 0;
and each time it is invoked, the code buf nc(buf ndex) would be replaced with the single-line buffer increment and tested to ensure that it is with the index range for the 20-element circular buffer. The problem is that the operation of the de ne is not easily read, and if there were an error in the code, you would not be able to see it easily. What is needed is a way to format the de ne so that the code can be seen easily. Fortunately, C has the backslash character (\) directive, which appends (or concatenate) the next line of text onto the end of the current line. By using this character directive, you can create a multiline de ne (or macro) that is much easier to read and understand, minimizing the opportunity for errors to come into your application. For example, using the backslash character, the buf nc de ne could be rewritten as
#de ne buf nc(indexvar) indexvar++; if (19 < indexvar) indexvar = 0; \ \ \ //
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