我编写了一个程序,还要求得到一定的分数,速度等级会变快,但是我写了蛇会出现吃到一定的数量后,蛇的速度是加快了,可是会忽块忽慢的,请高手帮忙解决.
#define N 200
#include <graphics.h>
#include <stdlib.h>
#include <dos.h>
#define LEFT 0x4b00
#define RIGHT 0x4d00
#define DOWN 0x5000
#define UP 0x4800
#define ESC 0x011b
int i,key;
int score=0;
int gamespeed=50000;
struct Food
{
int x;
int y;
int yes;
}food;
struct Snake
{
int x[N];
int y[N];
int node;
int direction;
int life;
}snake;
void Init(void);
void Close(void);
void DrawK(void);
void GameOver(void);
void GamePlay(void);
void PrScore(void);

void Init(void)
{
int gd=DETECT,gm;
initgraph(&gd,&gm,"c:\\tc");
cleardevice();
}

void DrawK(void)
{

setcolor(11);
setlinestyle(SOLID_LINE,0,THICK_WIDTH);
for(i=50;i<=600;i+=10)
{
rectangle(i,40,i+10,49);
rectangle(i,451,i+10,460);
}
for(i=40;i<=450;i+=10)
{
rectangle(50,i,59,i+10);
rectangle(601,i,610,i+10);
}
}

void GamePlay(void)
{
randomize();
food.yes=1;
snake.life=0;
snake.direction=1;
snake.x[0]=100;snake.y[0]=100;
snake.x[1]=110;snake.y[1]=100;
snake.node=2;
PrScore();
while(1)
{
while(!kbhit())
{
if(food.yes==1)
{
food.x=rand()%400+60;
food.y=rand()%350+60;
while(food.x%10!=0)
food.x++;
while(food.y%10!=0)
food.y++;
food.yes=0;
}
if(food.yes==0)
{
setcolor(GREEN);
rectangle(food.x,food.y,food.x+10,food.y-10);
}
for(i=snake.node-1;i>0;i--)
{
snake.x[i]=snake.x[i-1];
snake.y[i]=snake.y[i-1];
}

switch(snake.direction)
{
case 1: snake.x[0]+=10;break;
case 2: snake.x[0]-=10;break;
case 3: snake.y[0]-=10;break;
case 4: snake.y[0]+=10;break;
}
for(i=3;i<snake.node;i++)
{
if(snake.x[i]==snake.x[0]&&snake.y[i]==snake.y[0])
{
GameOver();
snake.life=1;
break;
}
}
if(snake.x[0]<55||snake.x[0]>595||snake.y[0]<55||
snake.y[0]>455)
{
GameOver();
snake.life=1;
}
if(snake.life==1)
break;
if(snake.x[0]==food.x&&snake.y[0]==food.y)
{
setcolor(0);
rectangle(food.x,food.y,food.x+10,food.y-10);
snake.x[snake.node]=-20;snake.y[snake.node]=-20;
snake.node++;
food.yes=1;
score+=10;
PrScore();
}
setcolor(4);
for(i=0;i<snake.node;i++)
rectangle(snake.x[i],snake.y[i],snake.x[i]+10,
snake.y[i]-10);
delay(gamespeed);
setcolor(0);
rectangle(snake.x[snake.node-1],snake.y[snake.node-1],
snake.x[snake.node-1]+10,snake.y[snake.node-1]-10);
}
if(snake.life==1)
break;
key=bioskey(0);
if(key==ESC)
break;
else
if(key==UP&&snake.direction!=4)
snake.direction=3;
else
if(key==RIGHT&&snake.direction!=2)
snake.direction=1;
else
if(key==LEFT&&snake.direction!=1)
snake.direction=2;
else
if(key==DOWN&&snake.direction!=3)
snake.direction=4;
}
}

void GameOver(void)
{
cleardevice();
PrScore();
setcolor(RED);
settextstyle(0,0,4);
outtextxy(200,200,"GAME OVER");
getch();
}

void PrScore(void)
{
char str[10];
setfillstyle(SOLID_FILL,YELLOW);
bar(50,15,220,35);
setcolor(6);
settextstyle(0,0,2);
sprintf(str,"score:%d",score);
outtextxy(55,20,str);
}

void Close(void)
{
getch();
closegraph();
}
void main(void)
{ Init();
DrawK();
GamePlay();
Close();
}