C++数组未知操作

#include <iostream>
using namespace std;

int main() {
    int arr[5] = {1, 2, 3, 4, 5};

    // 循环遍历数组
    for (int i = 0; i < 5; i++) {
        cout << arr[i] << " ";
    }
    cout << endl;

    // 数组元素求和
    int sum = 0;
    for (int i = 0; i < 5; i++) {
        sum += arr[i];
    }
    cout << "Sum: " << sum << endl;

    // 查找数组中的最大值
    int max = arr[0];
    for (int i = 1; i < 5; i++) {
        if (arr[i] > max) {
            max = arr[i];
        }
    }
    cout << "Max: " << max << endl;

    // 在数组末尾添加元素
    int numToAdd = 6;
    arr[5] = numToAdd;

    // 输出添加元素后的数组
    for (int i = 0; i < 6; i++) {
        cout << arr[i] << " ";
    }
    cout << endl;

    return 0;
}