Question

This may or may not be a very simple question, but I would like to know what function to call in order to figure out how many bytes are in an array at any given time. For example, how would I know what to put as the third argument in the send command in the code below?

int *array= new int[500];
memset(array, 0, sizeof(array));

//newsockfd is declared elsewhere in the code
send(newsockfd, array, _______, 0);

Answer 1

The size of an array is constant (it’s just a hunk of memory).

You’ll need to keep track of how many elements of the array are valid yourself, in a separate variable.

As others have noted, the last argument to memset should be the number of bytes you want set to 0 — but array is just a pointer, so sizeof(array) will yield only 4 (or 8 on a 64-bit platform). Again, you’ll need to manually pass in sizeof(int) * 500 (or use a constant for the 500 so you don’t have to update the number in multiple places if it changes).