11.数组名和指针（这⾥为指向数组⾸元素的指针）区别

 1 int main()
 2 {
 3     int a[2] = { 1,2 };
 4     int* p = a;
 5     cout << "a+1" << a + 1 << endl;
 6     cout << "p+1" << p + 1 << endl;
 7     cout << "*(a+1)" << *(a + 1) << endl;
 8     cout << "*(p+1)" << *(p + 1)<< endl;
 9     //a++;//数组名是右值，它不可以自增
10     p++;
11     system("pause");
12     return 0;
13 }

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

 1 #include<iostream>
 2 using namespace std;
 3 
 4 void fun(int *arr2) {
 5     int temp = 0;
 6     int length = sizeof(arr2) / sizeof(arr2[0]);
 7     cout << length << endl;
 8     for (int i = 0; i < length-1; i++)
 9     {
10         for (int j = 0; j < length -1-i; j++) 
11         {
12             if (arr2[j] > arr2[j+1]) 
13             {
14                 temp = arr2[j];
15                 arr2[j] = arr2[j + 1];
16                 arr2[j + 1] = temp;
17             }
18         }
19     }
20 }
21 int main()
22 {
23     int arr1[5] = { 8,5,2,4,1 };
24     fun(arr1);
25     for (int i = 0; i < 5; i++)
26     {
27         cout << arr1[i] << endl;
28     }
29     system("pause");
30     return 0;
31 }