//initialisation
S[0]=12;	//The snake
S[1]=5;     // as coordinate pairs for x and y
S[2]=13;    // S[0] and S[1] are the head
S[3]=5;
S[4]=14;
S[5]=5;
S[6]=15;
S[7]=5;

Z=0;
L=1;
M=6;

//direction: up=0, right=1, down=2, left=3
R=3;

//printing borderline
clear;
setcursor(50,0); print("#");
setcursor(50,1); print("#");
setcursor(50,2); print("#");
setcursor(50,3); print("#");
setcursor(50,4); print("#");
setcursor(50,5); print("#");
setcursor(50,6); print("#");
setcursor(50,7); print("#");
setcursor(50,8); print("#");
setcursor(50,9); print("#");
setcursor(50,10); print("#");
setcursor(50,11); print("#");
setcursor(50,12); print("#");
setcursor(50,13); print("#");
setcursor(50,14); print("#");
setcursor(0,15);
print("###################################################");

P[0]=7;     //the point to catch
P[1]=7;

while(1)
{
  for(C=M; C>=0; C=C-1)  //moving snake
  {
    S[2*(C+1)]=S[2*C];
    S[2*(C+1)+1]=S[2*C+1];
  }
  
  if(L<M)               //make snake longer (if needed)
    L=L+1;

  K=(int)keystate;      // get keyboard input
  if(K==0);
  else if(K==119)
    R=0;
  else if(K==100)
    R=1;
  else if(K==115)
    R=2;
  else if(K==97)
    R=3;




  if(R==0)
  {
    S[0]=S[2];
    S[1]=S[3]-1;
  }
  else if(R==1)
  {
    S[1]=S[3];
    S[0]=S[2]+1;
  }
  else if(R==2)
  {
    S[0]=S[2];
    S[1]=S[3]+1;
  }  
  else if(R==3)
  {
    S[1]=S[3];
    S[0]=S[2]-1;
  }
  sleep(100000);
  

  
  setcursor(S[2*L],S[2*L+1]);   //printing everything
  print(" ");
  setcursor(S[0],S[1]);
    print("O");
    setcursor(S[2],S[3]);
      print("o");
  for(C=1; C<L; C=C+1)     //checking if you touched the snake
  {
    if(S[0]==S[2*C] && S[1]==S[2*C+1])
      S[0]=-4;
  }
  setcursor(P[0],P[1]);
    print("*");

  if(S[0]==P[0] && S[1]==P[1])     //checking if you got the point
  {
    Z=Z+1;
    G=1;
    while(G==1)
    {
      P[0]=(int)rnd(49);
      P[1]=(int)rnd(14);
      G=0;
      for(C=0; C<L; C=C+1)
        if(P[0]==S[2*C] && P[1]==S[2*C+1])
          G=1;
     }
    M=M+3;
  }
  setcursor(55,1);
    print(Z);



  if(S[0]<0 || S[0]>49)    //checking if you touched the wall
    break;
  if(S[1]<0 || S[1]>14)
    break;
  



}
sleep(500000);
clear;
print("You lose!\nScore: ");
print(Z);
print("\n");