Status Push(Stack *s,SElemType e)
/* The element e has been pushed into the stack s. */
{
if(s->top-s->base>=s->stacksize)
{
s->base=(SElemType *)realloc(s->base,
(s->stacksize STACKINCREMENT)*sizeof(SElemType));
if(!s->base) Error("Overflow");
s->top=s->base s->stacksize;
s->stacksize =STACKINCREMENT;
}
*s->top =e;
return OK;
} /* Push */
SElemType Pop(Stack *s,SElemType e)
/* The element e has been removed from the stack s. */
{
if(s->top==s->base) Error("Pop");
e=*--s->top;
return e;
} /* Pop */
Status GetTop(Stack *s,SElemType *e)
/* The element e has got to the top of the stack s.*/
{
if(s->top==s->base) Error("GetTop");
*e=*(s->top-1);
return OK;
} /* GetTop */
/* Traverse the stack s using ''''''''''''''''''''''''''''''''visiting'''''''''''''''''''''''''''''''' function. */
/* Status StackTraverse(Stack *s,Status (* visit)(SElemType *se))
{
SElemType p;
int result;
if(s->top==s->base) return ERROR;
p=s->base;
while(!(p==s->top))
{
result=(*visit)(p);
p ;
}
return OK;
} */
Boolean Pass(PosType curpos)
/* Check if the current position can be passed. */
{
if(maze[curpos.x][curpos.y].==1&&
maze[curpos.x][curpos.y].foot==0&&maze[curpos.x][curpos.y].mark==0)
return TRUE;
else return FALSE;
} /* Pass */
void MarkPrint(PosType seat)
/* Mark the position seat. */
{
maze[seat.x][seat.y].mark=-1;
/* Marking ''''''''''''''''''''''''''''''''-1'''''''''''''''''''''''''''''''' symbolize the current position cannot be put. */
} /* MarkPrint */
void FootPrint(PosType curpos)
/* The foot of the curpos of the maze has been set ''''''''''''''''''''''''''''''''ue''''''''''''''''''''''''''''''''. */
{
maze[curpos.x][curpos.y].foot=1;
} /* FootPrint */
PosType NextPos(PosType seat,int di)
{
switch(di)
{
case 1: seat.y ; return seat; /* Eastward */
case 2: seat.x ; return seat; /* Southward */
case 3: seat.y--; return seat; /* Westward */
case 4: seat.x--; return seat; /* Northward */
default: seat.x=0; seat.y=0; return seat;
}
} /* NextPos */
/* The key to the program. */
/* Pre: The maze array & the startplace & the endplace.
Post: Find the one averse of the maze and perform the mazepath.
Uses: The ADT stack class.
*/
Status MazePath(PosType start,PosType end)
{
PosType curpos;
int curstep;
SElemType e;
Stack *s,stack;
stack.base=(SElemType *)malloc(STACK_INIT_SIZE*sizeof(SElemType));
if(!stack.base) Error("Overflow");
stack.top=stack.base;
stack.stacksize=STACK_INIT_SIZE;
s=&stack;
curpos=start;
curstep=1;
do
{
if(Pass(curpos))
{
FootPrint(curpos);
e.ord=curstep; e.seat=curpos; e.di=1;
gotoxy((curpos.y 1)*2,curpos.x 2);
putch(''''''''''''''''''''''''''''''''@'''''''''''''''''''''''''''''''');
delay(8000); /* pospone time. */
Push(s,e);
if(curpos.x==end.x&&curpos.y==end.y) /* Proceed recursively. */
{
DesoyStack(s);
return TRUE;
}
curpos=NextPos(curpos,1); /* Try next position. */
curstep ;
}
else
{
if(!StackEmpty(s))
{
e=Pop(s,e); /* Removed e from s. */
while(e.di==4&&!StackEmpty(s)) /* Four directions have been checked
and s is not empty. */
{
MarkPrint(e.seat);
gotoxy((e.seat.y 1)*2,e.seat.x 2);
putch(''''''''''''''''''''''''''''''''@'''''''''''''''''''''''''''''''');
delay(8000); /* Pospone time. */
gotoxy((e.seat.y 1)*2,e.seat.x 2);
putch('''''''''''''''''''''''''''''''' '''''''''''''''''''''''''''''''');
e=Pop(s,e); /* Remove e from s. */
curstep--;
}
if(e.di<4) /* The current position hasnot been checked. */
{
e.di ;
Push(s,e); /* Insert e into s. */
curpos=NextPos(e.seat,e.di); /* Try next position. */
}
}
}
}
while(!StackEmpty(s));
DesoyStack(s);
return FALSE;
} /* MazePath */
void main()
{
PosType start,end;
CreatMaze();
start.x=StartPlace.y;
start.y=StartPlace.x;
end.x=EndPlace.y;
end.y=EndPlace.x;
if(MazePath(start,end))
{
gotoxy(2,22);
printf("Path found\n");
}
else
{
gotoxy(2,22);
printf("Path not found\n");
}
getch();
clrscr();
}
p=1;
do
{
if(Pass(curpos))
{
FootPrint(curpos);
e.ord=curstep; e.seat=curpos; e.di=1;
gotoxy((curpos.y 1)*2,curpos.x 2);
putch(''''''''''''''''''''''''''''''''@'''''''''''''''''''''''''''''''');
delay(8000); /* pospone time. */
Push(s,e);
if(curpos.x==end.x&&curpos.y==end.y) /* Proceed recursively. */
{
DesoyStack(s);
return TRUE;
}
curpos=NextPos(curpos,1); /* Try next position. */
curstep ;
}
else
{
if(!StackEmpty(s))
{
e=Pop(s,e); /* Removed e from s. */
while(e.di==4&&!StackEmpty(s)) /* F
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