how to find the length of char array in c++ code example

Example: how to find length of character array in c++

#include <iostream>

using namespace std;

int main()
{
    char arr[] = "grepper";
    cout << sizeof(arr) << endl;
    return 0;
    //    keep it in mind that character arrays have length of one more than your characters because last one is for \0 to show that word has ended
}