如何用C語言寫貪吃蛇

#include<conio.h> #include<graphics.h> #include<time.h> #include<string.h> #include<malloc.h> #include<stdio.h> int grade=5,point=0,life=3; void set(),menu(),move_head(),move_body(),move(),init_insect(),left(),upon(),right(),down(),init_graph(),food_f(),ahead(),crate(); struct bug { int x; int y; struct bug *last; struct bug *next; }; struct fd { int x; int y; int judge; }food={0,0,0}; struct bug *head_f=NULL,*head_l,*p1=NULL,*p2=NULL; void main() { char ch; initgraph(800,600); set(); init_insect(); while(1) { food_f(); Sleep(grade*10); setcolor(BLACK); circle(head_l->x,head_l->y,2); setcolor(WHITE); move_body(); if(kbhit()) { ch=getch(); if(ch==27) { ahead(); set(); } else if(ch==-32) { switch(getch()) { case 72:upon();break; case 80:down();break; case 75:left();break; case 77:right();break; } } else ahead(); } else { ahead(); } if(head_f->x==food.x&&head_f->y==food.y) { Sleep(100); crate(); food.judge=0; point=point+(6-grade)*10; if(food.x<30||food.y<30||food.x>570||food.y>570) life++; menu(); } if(head_f->x<5||head_f->x>595||head_f->y<5||head_f->y>595) { Sleep(1000); life--; food.judge=0; init_graph(); init_insect(); menu(); } for(p1=head_f->next;p1!=NULL;p1=p1->next) { if(head_f->x==p1->x&&head_f->y==p1->y) { Sleep(1000); life--; food.judge=0; init_graph(); init_insect(); menu(); break; } } if(life==0) { outtextxy(280,300,"遊戲結束！"); getch(); return; } move(); }; } void init_graph() { clearviewport(); setlinestyle(PS_SOLID,1,5); rectangle(2,2,600,598); setlinestyle(PS_SOLID,1,1); } void set() { init_graph(); outtextxy(640,50,"1、開始 / 返回"); outtextxy(640,70,"2、退出"); outtextxy(640,90,"3、難度"); outtextxy(640,110,"4、重新開始"); switch(getch()) { case '1': menu();setcolor(GREEN);circle(food.x,food.y,2);setcolor(WHITE);return; case '2': exit(0);break; case '3': outtextxy(700,90,"：1 2 3 4 5");grade=getch()-48;set();break; case '4': food.judge=0,grade=5;point=0;life=3;init_insect();menu();break; default: outtextxy(250,300,"輸入錯誤！"); set();break; } } void menu() { char str[20],str1[]={"分數："},str2[]={"難度："},str3[]={"生命值："}; init_graph(); sprintf(str,"%d",point); strcat(str1,str); outtextxy(640,50,str1); sprintf(str,"%d",grade); strcat(str2,str); outtextxy(640,70,str2); sprintf(str,"%d",life); strcat(str3,str); outtextxy(640,90,str3); outtextxy(640,110,"設置：ESC"); } void init_insect() { head_f=(struct bug *)malloc(sizeof(struct bug)); head_f->last=NULL; head_f->x=300; head_f->y=300; p2=head_f->next=p1=(struct bug *)malloc(sizeof(struct bug)); p1->last=head_f; p1->x=295; p1->y=300; p1=p1->next=(struct bug *)malloc(sizeof(struct bug)); p1->next=NULL; p1->x=290; p1->y=300; p1->last=p2; head_l=p1; } void move() { for(p1=head_f;p1!=NULL;p1=p1->next) { circle(p1->x,p1->y,2); } } void move_head() { } void move_body() { for(p1=head_l,p2=p1->last;p2!=NULL;p1=p2,p2=p2->last) { p1->x=p2->x; p1->y=p2->y; } } void ahead() { p1=head_f; p2=p1->next; p2=p2->next; if(p1->x==p2->x) { if(p1->y>p2->y) head_f->y+=5; else head_f->y-=5; } else { if(p1->x>p2->x) { head_f->x+=5; } else head_f->x-=5; } } void upon() { p1=head_f->next; p1=p1->next; head_f->y-=5; if(p1->x==head_f->x&&p1->y==head_f->y) { head_f->y+=5; ahead(); } } void down() { p1=head_f->next; p1=p1->next; head_f->y+=5; if(p1->x==head_f->x&&p1->y==head_f->y) { head_f->y-=5; ahead(); } } void left() { p1=head_f->next; p1=p1->next; head_f->x-=5; if(p1->x==head_f->x&&p1->y==head_f->y) { head_f->x+=5; ahead(); } } void right() { p1=head_f->next; p1=p1->next; head_f->x+=5; if(p1->x==head_f->x&&p1->y==head_f->y) { head_f->x-=5; ahead(); } } void food_f() { if(!food.judge) { food.x=(rand()%117+1)*5; food.y=(rand()%117+1)*5; food.judge=1; if(food.x<30||food.y<30||food.x>570||food.y>570) { setcolor(RED); circle(f