THE_CLASSIC _SNAKE IN C++

SOURCE CODE: 
//For Youtube tutorials : https://goo.gl/s4rZwP

#include<iostream>
#include<windows.h>
#include<stdlib.h>
#include<time.h>
#include <conio.h>
using namespace std;
int i,y,pos[50],length=3,temp,j,f_PosX,f_PosY,movement,head_x=25;
int head_y=12,game=1,s_pos_X[200],s_pos_Y[200],temp_x[200],temp_y[200],score=0,wait=200,count=0;
char rc=187,hl=205,vl=186,lc=201,ldc=200,rdc=188,t=203,td=202,food=153,sn=254,key;
void gotoxy( int x, int y )
{
COORD p = {x, y};
SetConsoleCursorPosition(GetStdHandle( STD_OUTPUT_HANDLE ), p );
}
char snake[200];
void move();
void in_snake();
void pos_val();
void boder();
void food_pos();
void show_food();
void sn_dir();
void pause_play();
void game_play();
void sn_eat();
void check();
void start();
int main()
{
boder();
key=getch();
Sleep(10);
if(key=='p'|| key=='P')
{
start();
}
else
{
main();
}
}
void move()
{
if(movement==6)
{
gotoxy(s_pos_X[y],s_pos_Y[y]);
cout<<snake[y];
}
if(movement==4)
{
gotoxy(s_pos_X[y],s_pos_Y[y]);
cout<<snake[y];
}
if(movement==2)
{
gotoxy(s_pos_X[y],s_pos_Y[y]);
cout<<snake[y];
}
if(movement==8)
{
gotoxy(s_pos_X[y],s_pos_Y[y]);
cout<<snake[y];
}
}
void pos_val()
{
if(movement==6)
{
for(j=0;j<length;j++)
{
temp_x[j]=s_pos_X[j];
temp_y[j]=s_pos_Y[j];
}
for(j=0;j-1<length;j++)
{
s_pos_X[j+1]=temp_x[j];
s_pos_Y[j+1]=temp_y[j];
}
head_x=head_x+1;
s_pos_X[0]=head_x;
}
if(movement==4)
{
for(j=0;j<length;j++)
{
temp_x[j]=s_pos_X[j];
temp_y[j]=s_pos_Y[j];
}
for(j=0;j-1<length;j++)
{
s_pos_X[j+1]=temp_x[j];
s_pos_Y[j+1]=temp_y[j];
}
head_x=head_x-1;
s_pos_X[0]=head_x;
}
if(movement==2)
{
for(j=0;j<length;j++)
{
temp_x[j]=s_pos_X[j];
temp_y[j]=s_pos_Y[j];
}
for(j=0;j-1<length;j++)
{
s_pos_X[j+1]=temp_x[j];
s_pos_Y[j+1]=temp_y[j];
}
head_y=head_y+1;
s_pos_Y[0]=head_y;
}
if(movement==8)
{
for(j=0;j<length;j++)
{
temp_x[j]=s_pos_X[j];
temp_y[j]=s_pos_Y[j];
}
for(j=0;j-1<length;j++)
{
s_pos_X[j+1]=temp_x[j];
s_pos_Y[j+1]=temp_y[j];
}
head_y=head_y-1;
s_pos_Y[0]=head_y;
}
}
void intro()
{
gotoxy(54,4);
cout<<"THE_CLASSIC_SNAKE";
gotoxy(54,8);
cout<<"W : UP";
gotoxy(54,9);
cout<<"S : DOWN";
gotoxy(54,10);
cout<<"D : RIGHT";
gotoxy(54,11);
cout<<"A : LEFT";
gotoxy(54,12);
cout<<"P : PAUSE/PLAY";
if(score>0)
{
gotoxy(52,19);
cout<<"SCORE : "<<score;
}
gotoxy(55,24);
cout<<"CODED BY : ANKIT";
}
void boder()
{
intro();
gotoxy(0,0);
cout<<lc;
gotoxy(1,0);
for(i=0;i<=74;i++)
{
cout<<hl;
}
gotoxy(75,0);
cout<<rc;
for(i=1;i<=24;i++)
{
gotoxy(0,i);
std::cout<<vl;
}
gotoxy(0,25);
cout<<ldc;
gotoxy(1,25);
for(i=0;i<=74;i++)
{
std::cout<<hl;
}
gotoxy(75,25);
std::cout<<rdc;
for(i=1;i<=25;i++)
{
gotoxy(75,i);
cout<<vl;
}
gotoxy(75,25);
cout<<rdc;
gotoxy(50,0);
cout<<t;
for(i=1;i<=25;i++)
{
gotoxy(50,i);
cout<<vl;
}
gotoxy(50,25);
cout<<td;
}
void food_pos()
{
srand(time(0));
f_PosX=rand()%49+1;
f_PosY=rand()%24+1;
}
void show_food()
{
gotoxy(f_PosX,f_PosY);
cout<<food;
}
void sn_dir()
{
switch(key)
{
case'W':
case 'w': if(movement !=2)
{
movement=8;
}
break;
case 'S':
case 's': if(movement !=8)
{
movement=2;
}
break;
case 'D':
case 'd': if(movement !=4)
{
movement=6;
}
break;
case 'A':
case 'a': if(movement !=6)
{
movement=4;
}
break;
}
}
void sn_eat()
{
if(head_x==f_PosX && head_y==f_PosY)
{
length=length+1;
s_pos_X[length-1]=s_pos_X[length-2];
s_pos_Y[length-1]=s_pos_Y[length-2] - 1;
snake[length-1]=sn;
score=score+1;
food_pos();
count=count+1;
}
}
void check()
{
for(i=1;i<length;i++)
{
if(head_x==s_pos_X[i] && head_y==s_pos_Y[i])
{
game=0;
}
}
if(head_x==0)
{
for(i=0;i<=25;i++)
{
if(head_y==i)
{
game=0;
}
}
}
if(head_x==50)
{
for(i=0;i<=25;i++)
{
if(head_y==i)
{
game=0;
}
}
}
if(head_y==0)
{
for(i=0;i<=50;i++)
{
if(head_x==i)
{
game=0;
}
}
}
if(head_y==25)
{
for(i=0;i<=50;i++)
{
if(head_x==i)
{
game=0;
}
}
}
}
void in_snake()
{
snake[0]=1;
s_pos_X[0]=head_x;
s_pos_Y[0]=head_y;
for(i=1;i<length;i++)
{
snake[i]=sn;
s_pos_X[i]=head_x-i;
s_pos_Y[i]=head_y;
}
}
void game_play()
{
in_snake();
food_pos();
movement=6;
while(game==1)
{
system("cls");
if(kbhit())
{
key=getch();
sn_dir();
if(key=='p')
{
system("pause");
}
}
if(count==5)
{
count=0;
if(wait!=100)
{
wait=wait-10;
}
}
show_food();
boder();
for(y=0;y<length;y++)
{
move();
}
check();
sn_eat();
pos_val();
Sleep(wait);
if(game==1)
{
system("cls");
}
}
gotoxy(21,12);
cout<<"GAME OVER";
gotoxy(10,15);
cout<<"PRESS Y TO PLAY AGAIN ELSE PRESS N";
gotoxy(25,16);
key=getch();
cout<<key;
switch(key)
{
case 'y':score=0;
length=3;
game=1;
in_snake();
system("cls");
head_x=7;
head_y=1;
wait=200;
movement=6;
boder();
game_play();
break;
default:system("cls");
boder();
gotoxy(15,12);
cout<<"THANKS FOR PLAYING";
break;
}
gotoxy(0,26);
}
void start()
{
game_play();
}