演示多个字符从两边移动，向中间汇聚

#include <stdio.h>
#include <string.h>
#include <Windows.h>
#include <stdlib.h>
int main()
{
  char arr1[] = "welcome to China!!!";
  char arr2[] = "################!!!";
  int left = 0;
  //int right = sizeof(arr1) / sizeof(arr1[0]) - 2;      字符串末尾隐藏/0  所以要-2
  int right = strlen(arr1) - 1;                        //要引头文件
  while (left <= right)
  {
    arr2[left] = arr1[left];
    arr2[right] = arr1[right];
    printf("%s\n", arr2);
    Sleep(1000);                               //可以休息 一秒 
    system("cls");          //执行系统命令的函数-cls-清空屏幕
    left++;
    right--;
  }
  return 0;
}