How to find array length in C++? Problem with sizeof and pointers

Hello everyone! I'm a beginner C++ developer and I've encountered a very strange problem. I need to find out how many elements are in an array, but my attempts are failing. I write like this: ```cpp int arr[] = {10, 20, 30, 40, 50}; int size = sizeof(arr) / sizeof(arr[0]); cout << "Array length: " << size; // Outputs 5 — correct ``` But when I try to do the same inside a function, passing the array as a parameter, I get nonsense: ```cpp void printArrayLength(int arr[]) { int size = sizeof(arr) / sizeof(arr[0]); cout << "Array length: " << size; // Outputs 1 or 2, but not 5! } int main() { int myArray[] = {10, 20, 30, 40, 50}; printArrayLength(myArray); return 0; } ``` Why does this happen? sizeof(arr) inside the function does not give the size of the entire array, but what