getting lenght of array in c++ code example

Example 1: c++ get length of array

int arr[5];
int len = sizeof(arr) / sizeof(arr[0]);
// returns 5

Example 2: length of each number in array in c++

const int SIZE = 9;
	int arr[SIZE], arr2[SIZE];
	cout << "Enter numbers: \n";
	for (int i = 0; i < SIZE; i++)
		cin >> arr[i];
	for (int i = 0; i < SIZE; i++)
		cout << arr[i] << "\t";
	cout << endl;
	
	int count, number;
	for (int i = 0; i < SIZE; i++)
	{
		count = 0;
		number = arr[i];
		do
		{
			++count;
			number /= 10;
		} while (number);
		arr2[i] = count;
	}
	for (int i = 0; i < SIZE; i++)
		cout << arr2[i] << "\t";
	cout << endl;