#include<stdio.h>
#include<conio.h>
#include<time.h>
int main()
{
    /*(x,y)表示物体在屏幕上的初始位置,
    depth表示物体落地后反弹的高度,
    times用来控制时间的延迟,
    m用来控制运动的方向，m=-1说明是向下运动，m=1说明是向上运动*/
    int x=15,y=4,depth=20,times=20,m=1,i,j;
    for(;depth!=0;)
    {
        m=-m;
        if(m==1)
            depth--;
        for(i=1;i<=depth;i++)
        {
            printf("*****************************\n");
            printf("|  The program will show :  |\n");
            printf("|    the Free Falling       |\n");
            printf("*****************************\n");
            /*画出物体图像*/
            gotoxy(x,y);
            printf("***\n");
            gotoxy(x,y+1);
            printf("|*|\n");
            gotoxy(x,y+2);
            printf("***");
            /*控制不同的延迟显示的时间大小*/
            for(j=1;j<=times;j++)
                    delay(10);  
            clrscr();
            if(m==-1)
            {
                /*物体向下运动*/
                y++;  
                /*延时越来越小，说明速度越来越快*/
                times--;
            }
            else
            {
                /*物体向上运动*/
                y--;
                /*延时越来越大，说明速度越来越慢，说明是*/
                times++;
            }    
        }
    }
    getch();
    return 0;
}