返回斜着弹跳的小球

#include<stdio.h>

#include<stdlib.h>

int main()

{

 int i,j;

 int x=20;

 int y=0;

 int left=0;

 int right=30;

 int top=0;

 int bottom=30;

 int k=1;

 int velocity_x=1;

 int velocity_y=1;

 while(1)

 {

 x=x+velocity_x;

 y=y+velocity_y;

 system("cls");

 for(i=0;i<x;i++)

     printf("\n");

 for(j=0;j<y;j++)

     printf(" ");

 printf("o");

 printf("\n");

 if(x==top||x==bottom)

 {

 velocity_x=-(velocity_x);

 

 }

 if(y==left||y==right)

 {

 velocity_y=-(velocity_y);

 velocity_x=-(velocity_x);

 

 }

 

 }

 return 0;

}