停顿打印的实现

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
	char arr1[] = "What are you doing ?";
	char arr2[] = "********************";
	int left = 0;
	int right = strlen(arr1)-1;
	while (left <= right)
	{
		arr2[left] = arr1[left];
		arr2[right] = arr1[right];
		printf("%s\n", arr2);
		Sleep(600);//睡眠，设置延时，单位为ms头文件为#include <windows.h>但是这个编译器不知道在搞什么鬼给我报错 
		system("cls");//清理屏幕 头文件为 #include <stdlib.h> 
		left++;
		right--;
	}
	printf("%s", arr2);
	return 0;
}