Get length of an Array using a pointer

Question

Is there a way to get the length of an Array when I only know a pointer pointing to the Array?

See the following example

int testInt[3];
testInt[0] =         


        

Answer 1

You can if you point the the whole array and NOT point to the first element like:

int testInt[3];
int (*point)[3];
point = testInt;

printf( "number elements: %lu", (unsigned long)(sizeof*point/sizeof**point) );
printf( "whole array size: %lu", (unsigned long)(sizeof*point) );