Denso BHT-200QW Especificações descarregar pdf (Página 76)

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5.3 User-defined Functions

Out of user-defined functions, the SUB and FUNCTION functions can be called from other files.

The DEF FN function can be called only in the file where that function is defined and should

start with an FN.

The DEF FN and FUNCTION functions are classified into three types: integer functions, real

functions, and character functions, each of which should be defined in the following format:

User-defined Function

Format of DEF FN Format of FUNCTION

Integer functions

Real functions

Character functions

functionname %

functionname

functionname $





Setting Character String Length o

Setting Character String Length oSetting Character String Length o

Setting Character String Length of Returned Values of Character Functions

f Returned Values of Character Functionsf Returned Values of Character Functions

f Returned Values of Character Functions

A character function may return 1 through 255 characters. Note that the default character

string length results in the returned value of 40 characters.

If the returned value of the character string length is always less than 40 characters, you can

use the stack efficiently by setting the actual required value smaller than the default as the

maximum length. This is because the Interpreter positions returned values on the stack during

execution of user-defined functions so as to occupy the memory area by the maximum length

size. To define a function which results in the returned value of one character, for example,

describe as follows:

DEF FNshort$(i%)[ 1]

On the other hand, if the returned value is more than 40 characters, it is necessary to set the

actually required length. To define a function which results in the returned values of 128

characters, for example, describe as follows:

DEF FNlong$(i%)[128]





Dummy Arguments and Real Arguments

Dummy Arguments and Real ArgumentsDummy Arguments and Real Arguments

Dummy Arguments and Real Arguments

Dummy arguments are used for defining user-defined functions. In the example below, i% is a

dummy argument.

DEF FNfunc%(i%)

FNfunc%=i%*5

END DEF

Real arguments are actually passed to user-defined functions when those functions are called.

In the example below, 3 is a real argument.

PRINT FNfunc%(3)

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 586 587

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