Snake game in 'c'

Here is the coding of game 'snake' in c language:

#include <graphics.h>

#include <stdlib.h>

#include <dos.h>

#include <conio.h>

#include <stdio.h>

#include <time.h>

check();

end();

win();

int m[500],n[500],con=20,TEMP;

clock_t start,stop;

void main(void)

{

int gd=DETECT,gm,ch,maxx,maxy,x=13,y=14,p,q,spd=100;

int a=0,i=0,j,t,temp;

initgraph(&gd,&gm,"..\bgi");

setcolor(WHITE);

settextstyle(3,0,6);

outtextxy(200,2," SNAKE 2 BY RAJESH ");

settextstyle(6,0,2);

outtextxy(20,80," Use Arrow Keys To Direct The Snake ");

outtextxy(20,140," Avoid The Head Of Snake Not To Hit Any Part Of

Snake");

outtextxy(20,160," Pick The Beats Untill You Win The Game ");

outtextxy(20,200," Press 'Esc' Anytime To Exit ");

outtextxy(20,220," Press Any Key To Continue ");

outtextxy(20,220," DONT FORGET TO GIVE U R VALUABLE OPINION ");

ch=getch();

if(ch==27) exit(0);

cleardevice();

maxx=getmaxx();

maxy=getmaxy();

randomize();

p=random(maxx);

temp=p%13;

p=p-temp;

q=random(maxy);

temp=q%14;

q=q-temp;

start=clock();

while(1)

{

setcolor(WHITE);

setfillstyle(SOLID_FILL,con+5);

circle(p,q,5);

floodfill(p,q,WHITE);

if( kbhit() )

{

ch=getch(); if(ch==0) ch=getch();

if(ch==72&& a!=2) a=1;

if(ch==80&& a!=1) a=2;

if(ch==75&& a!=4) a=3;

if(ch==77&& a!=3) a=4;

}

else

{

if(ch==27

) break;

}

if(i<20){

m[i]=x;

n[i]=y;

i++;

}

if(i>=20)

{

for(j=con;j>=0;j--){

m[1+j]=m[j];

n[1+j]=n[j];

}

m[0]=x;

n[0]=y;

setcolor(WHITE);

setfillstyle(SOLID_FILL,con);

circle(m[0],n[0],8);

floodfill(m[0],n[0],WHITE);

setcolor(WHITE);

for(j=1;j<con;j++){

setfillstyle(SOLID_FILL,con+j%3);

circle(m[j],n[j],5);

floodfill(m[j],n[j],WHITE);

}

delay(spd);

setcolor(BLACK);

setfillstyle(SOLID_FILL,BLACK);

circle(m[0],n[0],8);

floodfill(m[0],n[0],BLACK);

setcolor(BLACK);

setfillstyle(SOLID_FILL,BLACK);

circle(m[j],n[j],5);

floodfill(m[j],n[j],BLACK);

}

stop=clock();

t=(stop-start)/CLK_TCK;

printf(" TIME %d sec ",t);

printf("SCORE %d

",con-5);

check();

if(x==p&&y==q) { con=con+5; if(spd>=5) spd=spd-5; else spd=5;

if(con>490) win();

p=random(maxx); temp=p%13; p=p-temp;

q=random(maxy); temp=q%14; q=q-temp;

}

if(a==1) y = y-14; if(y<0) { temp=maxy%14;y=maxy-temp;}

if(a==2) y = y+14; if(y>maxy) y=0;

if(a==3) x = x-13; if(x<0) { temp=maxx%13;x=maxx-temp;}

if(a==4) x = x+13; if(x>maxx) x=0;

if(a==0){ y = y+14 ; x=x+13; }

}

}

check(){

int a;

for(a=1;a<con;a++)

if(m[0]==m[a] && n[0]==n[a]) end();

else continue;

}

end()

{

int j,i;

setcolor(WHITE);

for(i=0;i<5;i++){

delay(500);

cleardevice();

delay(500);

for(j=0;j<=con;j++){

setfillstyle(SOLID_FILL,RED);

circle(m[j],n[j],5);

floodfill(m[j],n[j],WHITE);

}

}

settextstyle(3,0,4);

outtextxy(150,150," GAME OVER ");

getch();

getch();

exit(0);

}

win()

{

int j,i;

setcolor(WHITE);

for(i=0;i<5;i++){

for(j=0;j<=con;j++){

setfillstyle(SOLID_FILL,con);

circle(m[j],n[j],5);

floodfill(m[j],n[j],WHITE);

}

delay(500);

cleardevice();

delay(500);

}

settextstyle(3,0,4);

outtextxy(210,320," YOU WIN ");

getch();

exit(0);

}