Printing array backwards

[guru23]

Why's this program throwing me an error? I could've sworn this is the way to print an array backwards.

#include <iostream>
#include <cstdlib>
using namespace std;

int main() {
    int a[4] = {10, 20, 30, 40};

    for(int i = a.length() - 1; i >= 0; i--) cout << a[i] << " ";
    
    return 0;
}

[Chervil]

length() is a member function. That could work with for example a std::string.

But the plain array doesn't have any such functions.

You could instead use:

    const int length = sizeof(a) / sizeof(a[0]);

and then use length rather than a.length() in your code.