a problem in maze

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C

Hello all
I am working on maze in turbo c(command prompt not windows). I write 90% of it.
but there are 2 problems I do any work can't solve it.
1- When worm(** is my worm) reach a wall it don't stop. it can pass the wall?
2- the worm make longer but it should be ** in any time?

#include <stdio.h>
#include <conio.h>

int dir=0;
char wall[40][50]={
   {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
   {1,0,0,0,1,1,1,0,1,1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,1},
   {1,1,0,1,0,0,0,0,0,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,0,1},
   {1,1,0,1,0,0,0,0,0,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,0,1},
   {1,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,1,0,0,0,0,0,0,1,1},
   {1,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,1,1,0,1},
   {1,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,1,0,0,0,0,0,0,1,1},
   {1,1,1,1,1,0,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,0,1,1,0,1},
   {1,0,1,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1},
   {1,1,1,1,1,1,1,1,0,1,0,0,0,1,1,0,0,0,0,0,0,0,0,0,1,1},
   {1,1,0,1,0,0,0,0,0,0,1,1,1,0,0,0,0,0,1,1,1,1,1,1,0,1},
   {1,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,1,0,0,0,0,0,0,1,1},
   {1,1,1,1,1,0,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,0,1,1,0,1},
   {1,0,1,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
};

/* prototypes */
create_wall();
arrow_keys();
/* end of prototypes */

void main()
{
   int a=3,b=2;
   create_wall();
   lbl : arrow_keys();
   if (dir==72){b-=1; wall[a][b]='*';gotoxy(a,b); printf("%c",wall[a][b]);goto lbl;}
   if (dir==75){a-=1; wall[a][b]='*';gotoxy(a,b); printf("%c",wall[a][b]);goto lbl;}
   if (dir==77){a+=1; wall[a][b]='*';gotoxy(a,b); printf("%c",wall[a][b]);goto lbl;}
   if (dir==80){b+=1; wall[a][b]='*';gotoxy(a,b); printf("%c",wall[a][b]);goto lbl;}
   if (dir==0) {printf("exit");}
}




/* function to create the walls */
create_wall(){
   clrscr();
   int i,j;
   for(i=0;i&lt;15;i++){
      for(j=0;j&lt;26;j++){
      if (wall[i][j]==1) printf("²");
      else printf(" ");
      }
   printf("\n");
   }
   gotoxy(2,2);
   printf("**");
}
/* end of create_wall function */
////////////////////////////////////
/* function to define arrow keys */
int arrow_keys()
   {
   int ch;
   while(1)
      {
      ch=getch();
      if(ch==0)
	 {
	 ch=getch();
	 if(ch==72) {dir=72; break;}
	 if(ch==75) {dir=75; break;}
	 if(ch==77) {dir=77; break;}
	 if(ch==80) {dir=80; break;}
	 }
      else dir=0;
      break;

      }
}

Please help me to solve the problems.
Thanks in advance