On Sat, 9 Jan 1999, Yasushi Shoji wrote:
> in the function sub i is 4,
> and in main, it's 12.
That makes sense, when both your ints and pointers are 4 bytes
wide.
In main(), sizeof(a) says 12 because a is the address
of an array of 3 ints (3*4=12). In sub(), a equals 4 because
it is a pointer to an int. Do you see the difference ?
The book you are reading covers the subject, but I don't
know where.
> is it because C passes the value of a to the
> function sub?
> even though function sub is sub(int a[3])?
> ^^^
Passing arrays isn't something that is normally possible
in C, instead the address of an array is passed. You can
pass structures though.
> is there any way to get size of a[] in sub function?
void sub(int *a, int a_size);
Or you can always place the size of the array in
the being of the array. Or use a structure containing
a pointer to the array and the size of the array.
