Rockwell-automation 2708-NBD VBASIC Language Development Kit Manual de usuario descargar pdf (Pagina 77)

Appendix C

Application Library Subroutines

C–9

The menu string is a string in which each menu entry is preceded by a “ | ”

(vertical bar). Thus a menu$ such as:

has 5 entries; “Mastercard” is the 1st entry and may also be selected by

pressing M. “Cash” is the 4th entry and may also be selected by pressing C.

Note the use of “ \ ” to start a new line (the fact that the string was made by

adding two strings together cannot be detected by Menu%).

The actual menu displayed will look like:

Payment Type: <Mastercard> Visa Amex

Other Cash

The startingitem% is a value of 1 to 10, to indicate wh ich entry should be

selected first. Note that the global EXITOFFSET% is set to the entry which

was selected at exit.

e = Menu% ( startingitem%, menu$ )

FUNCTION Menu% ( sitem%, m$ )

LogE! Returns the natural log of a value.

x! = LogE! ( x! )

FUNCTION LogE! ( x )

Log10! Returns the base 10 log of a value.

x! – Log10! ( x! )

FUNCTION Log10! ( x )

Exponential! Returns e to the x

x! = Exponential! ( x! )

FUNCTION Exponential! ( x )

Power! Returns x to the power of y.

z! = Power! ( x!, y! )

FUNCTION Powerl! ( x, y )

CubeRoot! Returns the cube root of x.

x! = CubeRoot! ( x! )

FUNCTION CubeRoot! ( x )

SquareRoot! Returns the square root of x.

x! = SquareRoot! ( x! )

FUNCTION SquareRoot! ( x )

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Rockwell-automation 2708-NBD VBASIC Language Development Kit Manual de usuario Pagina 77