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Re: Array size
[Re: Fenriswolf]
#170866
12/04/07 08:43
12/04/07 08:43
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Joined: Oct 2004
Posts: 4,134
Netherlands
Joozey
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Expert
Joined: Oct 2004
Posts: 4,134
Netherlands
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What do you mean with size, amount of indexes? Then what are you trying to achieve with sizeof(my_array[0])? Furthermore, this is what the manual says about sizeof(): Quote:
The sizeof() function returns the size of a variable or a struct in bytes. This can be used to initialize structs through the zero macro that is defined in include\acknex.h
If you want to have the amount of indexes an array contains, you have to make your own function because as far as I'm aware, lite-c does not have such a function yet.
Not tested code which is inevitebly wrong, but it's about the concept:
Code:
int getArrayLength(var array) {
int n = 0;
while (array[n]){n++}
return n;
}
Last edited by Joozey; 12/04/07 08:44.
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Re: Array size
[Re: Joozey]
#170867
12/04/07 09:52
12/04/07 09:52
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Joined: Jan 2007
Posts: 221
Fenriswolf
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Posts: 221
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Hi, Quote:
What do you mean with size, amount of indexes?
Yes, I've meant the number of elements.
Quote:
Then what are you trying to achieve with sizeof(my_array[0])?
I wanted to calculate the size of a single array element in bytes.
Dividing the array size in bytes by the element size in bytes should result the array's length in elements, if I'm not mistaken.
If arrays are handled as pointers this would not work, though.
Your code works fine, thank you!
However, the last element of the array has to be NULL; otherwise a wrong value is returned:
var my_array[3] = { 1, 2 } // works
var my_array[3] = { 1, 2, 3 } // does not work
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Re: Array size
[Re: Fenriswolf]
#170868
12/04/07 17:47
12/04/07 17:47
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Joined: Oct 2004
Posts: 4,134
Netherlands
Joozey
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Posts: 4,134
Netherlands
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Quote:
Dividing the array size in bytes by the element size in bytes should result the array's length in elements, if I'm not mistaken.
Good point, hadn't thought of that idea. But I think arrays are indeed handled as pointers. I don't see a good solution for this at the moment, you'll just have to add NULL in every array I guess, or somehow store the index of each array at game start.
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Re: Array size
[Re: Joozey]
#170869
12/04/07 18:06
12/04/07 18:06
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Joined: Dec 2006
Posts: 78
Nevada, USA
Futurulus
Junior Member
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Junior Member
Joined: Dec 2006
Posts: 78
Nevada, USA
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Quote:
I think arrays are indeed handled as pointers.
Yeah -- I don't know about in Lite-C in this case, but in a conforming C compiler
Code:
sizeof(MyArray) / sizeof(MyArray[0])
would probably return 1 on a 32-bit system, because sizeof(a pointer) = 4 and sizeof(a var) = 4.
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