How can I know in C++ how many elements an array contains? [duplicate]

Answer 1

You can use sizeof(myarray)/sizeof(int).

But you really should start using std::array, which does the same thing as your array and is safer. And comes with a size() method.

Answer 2

Do this with:

std::size(myarray);

std::size is in <iterator>.

---

Some sources will tell you to use a "trick" like sizeof(myarray)/sizeof(myarray[0]). But this is error-prone. The name of an array decays really easily to a pointer, for which this "trick" gives the wrong result. std::size will either work, or break the build.

Plus, when you switch from C arrays to std::array, it'll still work!