C小程序源码，自己写的，部分网上的

#include "graphics.h" #include "stdlib.h" #include "alloc.h" main() { int flagx,flagy; void *ptr; int graphdriver=DETECT,graphmode,x,y; initgraph(&graphdriver,&graphmode,"d:\\tc"); settextstyle(1,0,1); outtextxy(10,10,"YangGuang's billiards"); setfillstyle(1,6); bar(40,40,600,440); setfillstyle(1,GREEN); bar(50,50,590,430); x=110;y=111; flagx=1; flagy=0; while(1) { if(x>578){ flagx=1;sound(220);delay(600);nosound();} if(x<62) { flagx=0;sound(220*2);delay(600);nosound();} switch(flagx) { case 0: { x++;} goto out1; case 1: { x--;}goto out1; } out1: if(y>417){ flagy=1;sound(220*3);delay(600);nosound();} if(y<62) { flagy=0;sound(220*4);delay(600);nosound();} switch(flagy) { case 0:{y++;} goto out2; case 1:{y--;}goto out2; } out2: setfillstyle(1,15); setcolor(15); fillellipse(x,y,10,10); delay(70); setfillstyle(1,GREEN); setcolor(GREEN); fillellipse(x,y,10,10); if(kbhit()) break; } getch(); closegraph(); }