从两边依次交换数组内容

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>//调用windows自带的函数

int main()
{
    char arr1[] = "welcome to my blog!";
    char arr2[] = "###################";
    int left = 0;
    int right = strlen(arr1) - 1;
    //int right = sizeof(arr1)/sizeof(arr1[0])-2;计算数组最后元素的下标
    while (left <= right)
    {
        arr2[left] = arr1[left];
        arr2[right] = arr1[right];
        printf("%s\n", arr2);
        Sleep(1000);//每次输出暂停一秒
        system("cls");//清除屏幕中所有显示
        left++;
        right--;
    }
    printf("%s\n", arr2);
    return 0;
}