How to find the last element in an int array?

Question

C++ / C#

How to find the last element in an int array?
No vectors

Answer 1

If the array is statically defined:

int alpha[100];

alpha[99]=4242;

const int last = alpha [ (sizeof(alpha) / sizeof(alpha[0]))-1];

If you only have a pointer to the beginning of the array, then nothing. Store the length separately.

Answer 2

Nothing, if you don't mark it.
To do this, in char-strings ("C-strings", "zero-terminated strings"), an element with a value '\0'(null character) is added to the end, on the presence of which standard functions rely, like strlen(const char*), which counts characters up to the first zero-terminator.
ZY Theoretically, there is still some allocation header, which is located before the dynamically allocated (that is, only in the heap) buffer, which is oriented free(void*)to, but this is not regulated by the standard in any way.
UPD: Since C++11 we have std::array, which actually wraps a buffer in an object.