11.数组名和指针（这⾥为指向数组⾸元素的指针）区别

int main()
{
    int a[2] = { 1,2 };
    int* p = a;
    cout << "a+1" << a + 1 << endl;
    cout << "p+1" << p + 1 << endl;
    cout << "*(a+1)" << *(a + 1) << endl;
    cout << "*(p+1)" << *(p + 1)<< endl;
    //a++;//数组名是右值，它不可以自增
    p++;
    system("pause");
    return 0;
}

注意不能通过形参指针求解实参数组的长度，因为指针在64位系统下长度永远是8个字节

#include<iostream>
using namespace std;

void fun(int *arr2) {
    int temp = 0;
    int length = sizeof(arr2) / sizeof(arr2[0]);
    cout << length << endl;
    for (int i = 0; i < length-1; i++)
    {
        for (int j = 0; j < length -1-i; j++) 
        {
            if (arr2[j] > arr2[j+1]) 
            {
                temp = arr2[j];
                arr2[j] = arr2[j + 1];
                arr2[j + 1] = temp;
            }
        }
    }
}
int main()
{
    int arr1[5] = { 8,5,2,4,1 };
    fun(arr1);
    for (int i = 0; i < 5; i++)
    {
        cout << arr1[i] << endl;
    }
    system("pause");
    return 0;
}