Pointer Variables

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POINTER VARIABLES

In MarxMenu, variables can point to other variables allowing parameters to be passed to procedures by reference as well as by value. A pointer variable stores the location of another variable. Any time a pointer variable is accessed, MarxMenu acts upon the variable that the pointer variable is pointing to. Pointer variables are set using the Loc (location) command.


Example:

   Var A B C
   A = Loc B

MarxMenu supports complex location pointers and pointers to other pointers. MarxMenu will resolve all references until real data is found.


Example:

   B = Loc A
   C = Loc B
   C[5] = 20
   Writeln A[5]  ;returns 20

Pointers can also be passed as parameters to procedures. Thus if A is an array of strings we can sort A as follows:


 Procedure SortTest (TestArray)
    SortArray(TestArray)
 EndProc

 SortTest (Loc A)  ;sorts array A

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