sizeof an array in a function c++ code example

Example 1: length of array in cpp

int size = sizeof(arr)/sizeof(arr[0])

Example 2: length of array c++

#include <iostream>
using namespace std;
int main() {
   int arr[5] = {4, 1, 8, 2, 9};
   int len = sizeof(arr);
   cout << "The length of the array is: " << len;
   return 0;
}