打印数组内容时，如何打印数组中的位置？

arr = [10, 20, 30, 40, 50]
index = 2
print(f"元素在位置 {index} 的值是: {arr[index]}")

let arr = [10, 20, 30, 40, 50];
let index = 2;
console.log(`元素在位置 ${index} 的值是: ${arr[index]}`);

int[] arr = {10, 20, 30, 40, 50};
int index = 2;
System.out.println("元素在位置 " + index + " 的值是: " + arr[index]);

#include <iostream>
using namespace std;

int main() {
    int arr[] = {10, 20, 30, 40, 50};
    int index = 2;
    cout << "元素在位置 " << index << " 的值是: " << arr[index] << endl;
    return 0;
}

int[] arr = {10, 20, 30, 40, 50};
int index = 2;
Console.WriteLine("元素在位置 " + index + " 的值是: " + arr[index]);

arr = [10, 20, 30, 40, 50]
index = 2
puts "元素在位置 #{index} 的值是: #{arr[index]}"

$arr = array(10, 20, 30, 40, 50);
$index = 2;
echo "元素在位置 " . $index . " 的值是: " . $arr[$index];