My First Encounter with C

/* Well What would this do? Ever Played Snake, try this one*/

"/" is used instesd of "<" and ">".

#include /stdio.h/
#include /conio.h/
#include /graphics.h/
#include /alloc.h/
#include /dos.h/
#include /stdlib.h/
#define up 72
#define down 80
#define left 75
#define right 77
#define pause 25
#define space 57
#define settings 31
struct body
{
int x,y;
struct body *next;
};
typedef struct body body;
void create_snake(body*);
void show_settings();
void draw_borders();
void draw_egg();
void draw_snake();
void status_bar();
void draw_head();
void erase_tail();
void disp_gameover();
int getkey();
int check_snake(int,int);
body *head,*tail;
int dir=1;
int speed=100;
int leftx,rightx,topx,bottomx;
int color = RED,fil_style=1,bor_color=BLACK,size = 10;
int score=0,egg_drawn=0,jump = 9;
int preveggx,preveggy;
void far *egg;
char scr[15];
int eggx,eggy;
void main()
{
int gm=DETECT,gd;
int key=0,num;
struct time tim;
void move_snake_right();
void move_snake_down();
void move_snake_left();
void move_snake_up();
initgraph(&gm,&gm,"g:\tc\bgi");
leftx=(size*2-1);
rightx=getmaxx()-(size*2);
topx=(size*2-1);
bottomx = getmaxy()-40;
setcolor(YELLOW);
setfillstyle(SOLID_FILL,YELLOW);
fillellipse(10,10,size/3,size/2);
egg = farmalloc(imagesize(10-size/2,10-size/2,10+size/2,10+size/2));
if(egg ==NULL)
{
printf("Insufficient Memory!");
exit(0);
}
getimage(10-size/2,10-size/2,10+size/2,10+size/2,egg);
draw_borders();
create_snake(head);
start:
fflush(stdin);
flushall();
while(!kbhit())
{
delay(speed);
if(egg_drawn==0)
{
status_bar();
eggx=eggy=0;
repeat:
gettime(&tim);
num = (int)(tim.ti_hund)*(int)(tim.ti_sec);
num = num%(rightx-leftx)/size;
eggx=num;
num = (int)(tim.ti_hund)*(int)tim.ti_sec;
num = num%(bottomx-topx)/size;
eggy=num;
if(check_snake(eggx,eggy))
goto repeat;
eggx =leftx+(eggx*size);
eggy =topx+(eggy*size);
preveggx =leftx+(eggx*size);
preveggy =topx+(eggy*size);
}
draw_egg(eggx,eggy);
switch(dir)
{
case 1:move_snake_right();
break;
case 2:move_snake_down();
break;
case 3:move_snake_left();
break;
case 4:move_snake_up();
}
}
key = getkey();
switch(key)
{
case up:if(dir!=2)
dir = 4;
break;
case down:if(dir!=4)
dir = 2;
break;
case right:if(dir!=3)
dir = 1;
break;
case left:if(dir!=1)
dir = 3;
break;
case pause:getch();
break;
case settings:show_settings();
setfillstyle(EMPTY_FILL,color);
bar(leftx,topx,rightx,bottomx);
draw_snake();
break;
case 1:closegraph();
exit(0);
}
goto start;
}
int getkey()
{
union REGS i,o;
i.h.ah = 0;
int86(0x16,&i,&o);
return o.h.ah;
}
void draw_borders()
{
setfillstyle(SOLID_FILL,BLUE);
floodfill(300,300,1);
setfillstyle(SOLID_FILL,BLACK);
setcolor(BLACK);
rectangle(leftx,topx,rightx,bottomx);
setfillstyle(SOLID_FILL,BLACK);
floodfill(300,300,BLACK);
rectangle(leftx,bottomx+5,rightx,getmaxy()-5);
}
void create_snake()
{
body *x;
setfillstyle(fil_style,color);
setcolor(bor_color);
if((x = malloc(sizeof(body)))==NULL)
{
printf("Short of memory!");
return;
}
x->x = size*3+leftx;
x->y = topx;
head = x;
bar(x->x,x->y,x->x+size,x->y+size);
rectangle(x->x,x->y,x->x+size,x->y+size);
if((x->next = malloc(sizeof(body)))==NULL)
{
printf("Short of memory!");
return;
}
x = x->next;
x->x = size*2+leftx;
x->y = topx;
bar(x->x,x->y,x->x+size,x->y+size);
rectangle(x->x,x->y,x->x+size,x->y+size);
if((x->next = malloc(sizeof(body)))==NULL)
{
printf("Short of memory!");
return;
}
x = x->next;
x->x = size+leftx;
x->y = topx;
bar(x->x,x->y,x->x+size,x->y+size);
rectangle(x->x,x->y,x->x+size,x->y+size);
if((x->next = malloc(sizeof(body)))==NULL)
{
printf("Short of memory!");
return;
}
x = x->next;
x->x = leftx;
x->y = topx;
bar(x->x,x->y,x->x+size,x->y+size);
rectangle(x->x,x->y,x->x+size,x->y+size);
x->next = NULL;
tail = x;
}
void move_snake_right()
{
body *x;
int nextx,nexty;
nexty = head->y;
if(head->x+size>=rightx)
nextx = leftx;
else
nextx = head->x+size;
if(check_snake(nextx,nexty)==1)
{
disp_gameover();
}
if(nextx == eggx&&nexty == eggy)
{
egg_drawn=0;
score+=jump;
x = malloc(sizeof(body));
if(x==NULL)
{
printf("Insufficient Memory!");
exit(0);
}
x->x = nextx;
x->y = nexty;
x->next = head;
head = x;
draw_head();
}
else
{
erase_tail();
x = head;
while((x->next)->next !=NULL)
x = x->next;
x->next = NULL;
tail->x = nextx;
tail->y = nexty;
tail->next = head;
head = tail;
tail = x;
draw_head();
}
}
void move_snake_left()
{
body *x;
int nextx,nexty;
if(head->x-sizex-size;
nexty = head->y;
if(check_snake(nextx,nexty)==1)
{
disp_gameover();
}
if(nextx==eggx&&nexty==eggy)
{
egg_drawn=0;
score+=jump;
x = malloc(sizeof(body));
if(x==NULL)
{
printf("Insufficient Memory!");
exit(0);
}
x->x = nextx;
x->y = nexty;
x->next = head;
head = x;
draw_head();
}
else
{
erase_tail();
x = head;
while((x->next)->next !=NULL)
x = x->next;
x->next = NULL;
tail->x = nextx;
tail->y = nexty;
tail->next = head;
head = tail;
tail = x;
draw_head();
}

}
void move_snake_up()
{
body *x;
int nextx,nexty;
if(head->y-sizey-size;
nextx = head->x;
if(check_snake(nextx,nexty)==1)
{
disp_gameover();
}
if(nextx==eggx&&nexty==eggy)
{
egg_drawn=0;
score+=jump;
x = malloc(sizeof(body));
if(x==NULL)
{
printf("Insufficient Memory!");
exit(0);
}
x->x = nextx;
x->y = nexty;
x->next = head;
head = x;
draw_head();
}
else
{
erase_tail();
x = head;
while((x->next)->next !=NULL)
x = x->next;
x->next = NULL;
tail->x = nextx;
tail->y = nexty;
tail->next = head;
head = tail;
tail = x;
draw_head();
}
}
void move_snake_down()
{
body *x;
int nextx,nexty;
if(head->y+size>=bottomx)
nexty = topx;
else
nexty = head->y+size;
nextx = head->x;
if(check_snake(nextx,nexty)==1)
{
disp_gameover();
}
if(nextx==eggx&&nexty==eggy)
{
egg_drawn=0;
score+=jump;
x = malloc(sizeof(body));
if(x==NULL)
{
printf("Insufficient Memory!");
exit(0);
}
x->x = nextx;
x->y = nexty;
x->next = head;
head = x;
draw_head();
}
else
{
erase_tail();
x = head;
while((x->next)->next !=NULL)
x = x->next;
x->next = NULL;
tail->x = nextx;
tail->y = nexty;
tail->next = head;
head = tail;
tail = x;
draw_head();
}

}
void draw_egg(int x,int y)
{
putimage(x,y,egg,COPY_PUT);
egg_drawn = 1;
}

void status_bar()
{
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(leftx+1,bottomx+4,rightx-1,getmaxy()-6);
sprintf(scr,"Score:%d",score);
setcolor(RED);
settextstyle(2,0,6);
outtextxy(leftx+5,bottomx+10,scr);
outtextxy(rightx-75,bottomx+10,"S");
setcolor(DARKGRAY);
outtextxy(rightx-66,bottomx+10,"ettings");
setcolor(RED);
outtextxy(rightx-150,bottomx+10,"P");
setcolor(DARKGRAY);
outtextxy(rightx-142,bottomx+10,"ause");
}
void draw_head()
{
setfillstyle(fil_style,color);
bar(head->x,head->y,head->x+size,head->y+size);
setcolor(bor_color);
rectangle(head->x,head->y,head->x+size,head->y+size);
}
void erase_tail()
{
setfillstyle(EMPTY_FILL,color);
bar(tail->x,tail->y,tail->x+size,tail->y+size);
}
int check_snake(int x,int y)
{
body *z;
z = head;
while(z->next!=NULL)
{
if(z->x==x&&z->y==y)
return 1;
z=z->next;
}
if(z->x==x&&z->y==y)
return 1;
return 0;
}
void disp_gameover()
{
int x1,x2,y1,y2;
x1 = getmaxx()/2-100;
y1 = getmaxy()/2-65;
x2 = getmaxx()/2+100;
y2 = getmaxy()/2+65;
setfillstyle(SOLID_FILL,9);
bar(x1,y1,x2-30,y2-75);
setcolor(YELLOW);
settextstyle(3,0,3);
outtextxy(x1+10,y1+10,"GAME OVER!!");
getch();
closegraph();
exit(0);
}
void show_settings()
{
int key=0,maxspeed=25,least = 145;
int x1,y1,x2,y2,width;
int no,i;
setfillstyle(SOLID_FILL,LIGHTGRAY);
x1 = (getmaxx()+1)/2-150;
x2 = (getmaxx()+1)/2+150;
y1 = (getmaxy()+1)/2-150;
y2 = (getmaxy()+1)/2+150;
setcolor(BLUE);
bar3d(x1,y1,x2,y2,20,1);
settextstyle(2,0,6);
setcolor(RED);
outtextxy(x1+20,y1+100,"Speed:");
outtextxy(x1+85,y1+95,"-");
outtextxy(x2-10,y1+95,"+");
outtextxy(x1+20,y1+150," Use the left and right");
outtextxy(x1+20,y1+180,"arrow keys to increase and ");
outtextxy(x1+20,y1+210," decrease the speed ");
outtextxy(x1+20,y1+240,"Press escape to return");
outtextxy(x1+20,y1+270," to the game");
setcolor(BLUE);
line(x1+100,y1+120,x2-20,y1+120);
line(x1+100,y1+120,x1+100,y1+90);
line(x2-20,y1+120,x2-20,y1+90);
width = ((x2-20)-(x1+100))/8;
start:
setfillstyle(SOLID_FILL,LIGHTGRAY);
for(i=1;i<=no;i++) { bar(x1+100+1,y1+90+1,x1+100+(i*width)-1,y1+120-1); setcolor(LIGHTGRAY); rectangle(x1+100+1,y1+90+1,x1+100+(i*width)-1,y1+120-1); } no = (speed-25)/15; setfillstyle(SOLID_FILL,BLUE); for(i=1;i<=no;i++) { bar(x1+100+1,y1+90+1,x1+100+(i*width)-1,y1+120-1); setcolor(LIGHTGRAY); rectangle(x1+100+1,y1+90+1,x1+100+(i*width)-1,y1+120-1); } def: key = getkey(); switch(key) { case right:if(speedmaxspeed)
speed-=25;
goto start;
case 1:return;
default:goto def;
}
}
void draw_snake()
{
body *x;
x = head;
setfillstyle(SOLID_FILL,color);
setcolor(bor_color);
while(x->next!=NULL)
{
bar(x->x,x->y,x->x+size,x->y+size);
rectangle(x->x,x->y,x->x+size,x->y+size);
x = x->next;
}
}