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Read e-book online Adobe Dreamweaver CS3: Webseiten entwickeln mit (X)HTML, PDF

By Richard Beer

ISBN-10: 3836210339

ISBN-13: 9783836210331

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"OOP" ist "in". Die modernste paintings, Programme zu schreiben, wird in diesem didaktisch vorz}glich aufbereiteten Lehrbuch vermittelt. Das Schwergewicht der Darstellung liegt auf der methodischen Darstellung der Gurndlagen und Konzepte pbjektorientierten Programmierens: Objekte, Klassen, Vererbung,Instanzen, Botschaften und abstrakte Datentypen werden verdeutlicht.

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The intrinsic function SIZE is often used when declaring automatic arrays. SIZE has the form: SIZE(ARRAY [,DIM]) This returns the extent of ARRAY along dimension DIM, or returns the size of ARRAY if DIM is absent. 52 Fortran 90 Student Notes Array Processing Note that an automatic array must not appear in a SAVE or NAMELIST statement, nor be initialised in a type declaration. The following example shows the automatic arrays, work1 and work2 which take their size from the dummy arguments n and a: SUBROUTINE sub(n,a) IMPLICIT NONE INTEGER :: n REAL, DIMENSION(n,n), INTENT(INOUT) :: a REAL, DIMENSION(n,n) :: work1 REAL, DIMENSION(SIZE(a,1)) :: work2 ...

This is necessary as the function name is already used within the body of the function as a result variable, and hence using it as a recursive reference to itself may cause ambiguities in some cases. Thus a RESULT variable is used, with a name different to the function itself, and then within the function, any reference to the actual function name is interpreted as a recursive call to the function. The classic textbook example of a recursive function, is the factorial calculation: RECURSIVE FUNCTION fact(n) RESULT (res) IMPLICIT NONE INTEGER INTENT(IN) :: n INTEGER :: res IF (n == 1) THEN res=1 ELSE res=n*fact(n-1) ENDIF END FUNCTION fact An important application of recursive procedures is where we have a variable number of DO loops: DO DO DO .

All arguments prior to the first keyword must match — once a keyword is used all the rest must use keywords. not allowed Note that an interface is not required in the above example as area is an internal function, and similarly one would not be required for a module subprogram with keyword arguments. This is because both have explicit interfaces. In the case of an external procedure with argument procedures, an interface must be provided. 5 Optional Arguments In some situations, not all the procedure’s arguments need be present each time it is invoked.

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Adobe Dreamweaver CS3: Webseiten entwickeln mit (X)HTML, Ajax, CSS, PHP und MySQL by Richard Beer

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