一维数组之元素逆置

从b站上黑马程序员的C++课里学到的元素逆置

 1 #include <iostream>
 2 using namespace std;
 3 int main()
 4 {
 5     int arr[5] = { 1,2,3,4,5 };
 6     int start = 0; //起始下标
 7     int end = sizeof(arr) / sizeof(arr[0]) - 1; //结束下标 = 元素个数 - 1
 8     for (int i = 0; i < 5; i++)
 9     {
10         cout << arr[i] << " ";
11     }
12     cout << endl;
13     while (start < end) //走到中间就不用换了
14     { //起始下标与结束下标的元素互换
15         int temp = arr[start]; 
16         arr[start] = arr[end];
17         arr[end] = temp;
18         start++; //下标更新
19         end--;    
20     }
21     for (int i = 0; i < 5; i++)
22     {
23         cout << arr[i] << " ";
24     }
25     return 0;
26 }