Questions About Array Declaration

[gundalav]

Dear all,

Some time I see such a code:

   int array[] = { -2, 99, 0, -743, 2, 3, 4 };
   int array_size = 7;

Why [] and size is separated and why the array is not declared this way?

   int array[7] = { -2, 99, 0, -743, 2, 3, 4 };

Is there any case where only Array is preferrable than
vector.

[Bazzy]

when you have [] on array declaration means that the array size is chosen by the compiler depending on the elements given.
An array is useful just for simple stuff

[jsmith]

Well, the above code is stupid. The size is omitted usually so that the programmer doesn't have to count the elements, since the compiler is pretty good at counting.

But line 2 should read

int array_size = sizeof(array) / sizeof( array[0] );

Or better yet

template< typename T, size_t N >
size_t ArraySize( T (&)[ N ] )
{ return N; }

//...
int array_size = ArraySize( array );