const error

[BEN10]

This code gives error. I found this code in C++ forum but when i tried to run the simplest form it also gave me error. That's why i started a new thread.

#include <stdio.h>
#define a 10
int main(void)
{
const int s=26;
int arr[s];
}

Errors

Error	1	error C2057: expected constant expression
Error	2	error C2466: cannot allocate an array of constant size 0	
Error	3	error C2133: 'arr' : unknown size

But when i replace s with a, which is #defined the error is rectified. Why is this so? 's' being a constant identifier , should not give errors.

[Salem]

So wait for the answer to the thread you found the question on.
Hello, is this thing on?

[BEN10]

So wait for the answer to the thread you found the question on.
Hello, is this thing on?

If you know the reason then tell me otherwise if nobody gives me the reason on this thread obviously i'll have to wait for the answer in the other thread. So dont tell me whether to wait or not.

[valaris]

Because when the stack frame for main is being created s hasn't been initialized (to 26), so the compiler can't generate the appropriate/accurate machine code for constructing the stack. Try making it global.

[Salem]

If everybody started a new thread for every question they saw already posted, the board would be unusable.