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Re: Help: Pointer [message #14885 is a reply to message #14865]

Fri, 02 April 1999 00:00

VU KHAC Tri
Messages: 25
Registered: March 1999

Junior Member

>> In C, I can write:
>>
>> void XXX ()
>> {
>> int C = 4;
>> int *pC;
>> pC = &C; /*pC points to C*/
>> }
>>
>> I cannot find out how to do this in IDL ?
>
> IDL> c = 4
> IDL> pC = Ptr_New(/Allocate_Heap)
> IDL> *pC = c
>

I found this :

IDL> c = 4
IDL> pc = PTR_NEW(/ALLOCATE_HEAP)
IDL> *pc = c
IDL> print, *pc
4
IDL> c = 5
IDL> print, *pc
4

But in C, when c is modified, (*pc) is also modified because pc points
to the memory where c is. That mean, if c = 5, *pc = 5.

Thank you so much for your book.
Best regards,
Tri.

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[Message index]

		Re: Help: Pointer By: steinhh on Sat, 03 April 1999 00:00
		Re: Help: Pointer By: VU KHAC Tri on Fri, 02 April 1999 00:00
		Re: Help: Pointer By: davidf on Fri, 02 April 1999 00:00

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