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Re: Function in C
Posted: Fri Mar 13, 2009 5:06 am
by AndrewAPrice
The advantages of floating point addresses, you could check to see if it's a NaN
Re: Function in C
Posted: Fri Mar 13, 2009 6:26 am
by Solar
Combuster wrote:that's why you should compare to NULL instead of comparing to 0. On machines without MMU you'll see often enough that RAM starts at 0 and the program is in ROM somewhere else. And then your code must still be able to work.
Ehm... actually, no.
The definition of a null pointer constant is "an integer constant expression with the value 0, or such an expression cast to type void *".
Re: Function in C
Posted: Fri Mar 13, 2009 9:40 am
by Creature
Solar wrote:Combuster wrote:that's why you should compare to NULL instead of comparing to 0. On machines without MMU you'll see often enough that RAM starts at 0 and the program is in ROM somewhere else. And then your code must still be able to work.
Ehm... actually, no.
The definition of a null pointer constant is "an integer constant expression with the value 0, or such an expression cast to type void *".
Yep, I believe in C, NULL is defined as
Code: Select all
#define NULL ((void *) 0) //or something equivalent.
whilst in C++ it's defined as (or should be defined as, if you use it, according to Bjarne Stroustrup):