C语言 弹跳小球

include <stdio.h>

include <stdlib.h>

include <windows.h>

int main()
{
int i, j;
int x=2;
int y = 5;
int velocity_x =1;
int velocity_y =1;
int left =0;
int right =80;
int top = 0;
int bottom = 10;

while(1)
{		
		
	x = x + velocity_x;
	y = y + velocity_y;
	system("cls");


	for (i=1; i <x; i++)
	{
		printf("\n");
	}
	for (j=1; j<y; j++)
	{
		printf(" ");
	}
	printf("o\n");
	if ((x==top)|| (x==bottom))
		velocity_x = -velocity_x;
	if ((y==left)||(y==right))
		velocity_y = -velocity_y;
}



return 0;

}