C - What will be difference b/w 5th and 6th statements?

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What will be difference b/w 5th and 6th statements?

1. #define MAX 100
2. main()
3. {
4. int max=100;
5. int a[MAX];
6. int b[max];
7. }

Total Answers and Comments: 3

Last Update: September 19, 2008 Asked by: Pramoda.M.A

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Best Rated Answer

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Submitted by: vinayps03

Size of an array can't be dynamically resized at runtime (one of the reasons y v use data structures!)
5th line: size of a[MAX] is constant (100) --> so no probs here.
6th line: Compilation error..
c:Code(6) : error C2057: expected constant expression

c:Code(6) : error C2466: cannot allocate an array of constant size 0

c:Code(6) : error C2133: 'b' : unknown size

Above answer was rated as good by the following members:
sourabh_t

August 06, 2008 16:13:59

vinayps03

Member Since: August 2008 Contribution: 1

RE: What will be difference b/w 5th and 6th statements?

c:Code(6) : error C2466: cannot allocate an array of constant size 0

c:Code(6) : error C2133: 'b' : unknown size

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Overall Rating: +1

August 07, 2008 03:20:58

kalai4best

Member Since: August 2008 Contribution: 2

RE: What will be difference b/w 5th and 6th statements?

max can be used only within the main() and has a impact within that. But MAX can be used in any kind of user defined functions.

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September 19, 2008 03:17:19

mayankjaan

Member Since: September 2008 Contribution: 1

RE: What will be difference b/w 5th and 6th statements?

On 5th statement work fine.

But on 6 the statement it gives compilation error.

error C2057: expected constant expression

error C2466: cannot allocate an array of constant size 0

error C2133: 'b' : unknown size

Conclusion:

The macro value expansion done at compilation time but the assignment of
variable value at run time.

Also the array has property to assign constant value not and variable value

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