#include <windows.h>
#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <string.h>
#include <conio.h>
#define SIZEMAX   100  /*长度*/
#define SNAKELEN  10   /*移动距离*/
#define SPEED     100  /*初始速度*/
typedef enum
{
    left,right,up,donw
}DIR;
typedef struct
{
    int x;
    int y;
}COOR;
struct FOOD
{
    COOR crd;
    int flag;
}food;
struct SNAKE
{
    COOR crd[SIZEMAX];
    int node;
    DIR dir;
}snake;
int speed=SPEED;

/*主函数*/
void main()
{
    init();
    while(1){
        while(!kbhit())   {
            if(!food.flag)   setfoodcrd();
            showfood();
            judgerlod();
            judgesef();
            snakemove();
            Sleep(speed);
        }
        changeskdir();
    }
}
void init()
{
    initgraph(640,480);
    srand(time(NULL));
    food.flag=0;
    snake.crd[0].x=0+SNAKELEN;
    snake.crd[0].y=0;
    snake.crd[1].x=0;
    snake.crd[1].y=0;
    snake.node=2;
    snake.dir=right;    /*默认向右*/
}
/*随机生成食物*/

void setfoodcrd()
{
    food.crd.x=rand()%(600/SNAKELEN)*SNAKELEN;
    food.crd.y=rand()%(480/SNAKELEN)*SNAKELEN;
    food.flag=1;
}
/*画食物*/
void showfood()
{
    rectangle(food.crd.x,food.crd.y,food.crd.x+SNAKELEN,food.crd.y+SNAKELEN);
}
/*蛇*/
void showsnake()
{
    int i;
    for(i=snake.node-1;i>=0;i--)
        rectangle(snake.crd[i].x,snake.crd[i].y,snake.crd[i].x+SNAKELEN,snake.crd[i].y+SNAKELEN);
    setcolor(BLACK);
    rectangle(snake.crd[snake.node].x,snake.crd[snake.node].y,snake.crd[snake.node].x+SNAKELEN,snake.crd[snake.node].y+SNAKELEN);
    setcolor(WHITE);
    rectangle(snake.crd[snake.node-1].x,snake.crd[snake.node-1].y,snake.crd[snake.node-1].x+SNAKELEN,snake.crd[snake.node-1].y+SNAKELEN);
}
/*移动*/
void snakemove()
{
    int i,for(i=snake.crd;i>0;i--)
    {
        snake.crd[i].x=snake.crd[i-1].x;
        snake.crd[i].y=snake.crd[i-1].y;
    }
    switch(snake.dir)
    {
    case up:snake.crd[0].y-=SNAKELEN;break;
    case donw:snake.crd[0].y+=SNAKELEN;break;
    case left:snake.crd[0].x-=SNAKELEN;break;
    case right:snake.crd[0].x+=SNAKELEN;
    }showsnake;
}
/*改变方向*/
void changeskdir()
{
    char key;
    key=getch();
    switch(key)
    {
    case'w':    case'W':    if(snake.dir!=donw)snake.dir=up;break;
    case's':    case'S':    if(snake.dir!=up)snake.dir=donw;break;
    case'a':    case'A':    if(snake.dir!=right)snake.dir=left;break;
    case'd':    case'D':    if(snake.dir!=left)snake.dir=right;break;
    }
}
/*Game Over*/
void judgeslod()
{
    int i;
    if(snake.crd[0].x<0||snake.crd[0].x>=640||snake.crd[0].y<0||snake.crd[0].y>=480)
        gameover();
    for(i=snake.node-1;i>0;i--)
        if(snake.crd[0].x==snake.crd[i].x&&snake.crd[0].y==snake.crd[i].y)
            gameover();
}
/*吃到食物*/
void judgefood()
{
    if(snake.crd[0].x==food.crd.x&&snake.crd[0].y==food.crd.y)
    {
        snake.node++;        setcolor(BLACK);
        rectangle(food.crd.x,food.crd.y,food.crd.x+SNAKELEN,food.crd.y+SNAKELEN);
        setcolor(WHITE);    food.flag=0;
    }
}

你这是要干嘛呀

就是玩，但是自己不会做太好