how to tell when you've reached the end of a C array? (specifically argv)

Question

been asked a question on this, basically coming up with argc...without actually having argc

if your given argv, which as I understand essentially a array of pointers to the relevant char arrays of each inputted argument,

how would I actually go about counting the number of pointers in argv?

Answer 1

The C standard specifies:

argv[argc] shall be a null pointer.

So you can always detect the end by testing for 0.