HP SunSoft Pascal 4.0 Manual do Utilizador descarregar pdf (Página 157)

100

101

The C–Pascal Interface 133

functions can be passed to other languages as arguments, the static links for all

procedure or function arguments are placed after the end of the conformant

array bounds pairs, if any.

Routines in other languages can be passed to Pascal; a dummy argument must

be passed in the position normally occupied by the passed routine’s static link.

If the passed routine is not a Pascal routine, the argument is used only as a

placeholder.

Global Variables in C and Pascal

If the types are compatible, a global variable can be shared between C and

Pascal.

An example:

The Pascal procedure,

GloVar.p

var

Year: integer;

procedure GloVar;

begin

Year := 2001

end; { GloVar }

The C main program,

GloVarMain.c

#include <stdio.h>

extern void GloVar();

int Year;

int main(void)

{

Year = 2042;

GloVar();

printf( " %d \n", Year ) ;

}

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