Set the password with the stack

#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <stdlib.h>
#define STACK_INIT_SIZE 10
#define OK 1
#define TRUE 1
#define FALSE 0
#define ERROR 0
Char password[10]= "abcdef"; /* Password, global variable * *
typedef char Selemtype;
typedef struct STACK/* Definition Stack type * *
{
Selemtype *base;
Selemtype *top;
int stacksize;
int length;
}sqstack,*stack;
typedef int STATUS;
void Initstack (Stack *s)/* Initialize STACK * *
{
*s= (Sqstack *) malloc (sizeof (sqstack));
(*s)->base= (Selemtype *) malloc (stack_init_size*sizeof (Selemtype));
if (!) ( *s)->base) exit (-1);
(*s)->top= (*s)->base;
(*s)->stacksize=stack_init_size;
(*s)->length=0;
}
Status destroystack (Stack *s)/* Destroy Stack * *
{
Free ((*s)->base);
Free ((*s));
return OK;
}
void Clearstack (Stack *s)/* Put the stack as empty */
{
(*s)->top= (*s)->base;
(*s)->length=0;
}
Status stackempty (Sqstack S)/* To determine whether the stack is empty * *
{
if (s.top==s.base) return TRUE;
Else
return FALSE;
}
void Push (Stack *s,selemtype e)/* Press the data into the stack * *
{
if ((*s)->top-(*s)->base>= (*s)->stacksize)
{
(*s)->base= (Selemtype *) realloc (*s)->base,
((*s)->stacksize + 2) * sizeof (Selemtype));
if (!) ( *s)->base) exit (-1);
(*s)->top= (*s)->base+ (*s)->stacksize;
(*s)->stacksize + + 2;
}
* ((*s)->top++) =e;
+ + (*s)->length;
}
Status Pop (Stack *s)/* Delete Stack top element * *
{
if ((*s)->top== (*s)->base) return ERROR;
(*s)->top--;
--(*s)->length;
return OK;
}
Status GetTop (Stack s,selemtype *e)/* Return top element of stack * *
{
if (s->top==s->base) return ERROR;
*e=* (s->top-1);
s->top--;
}
void Change (Sqstack s,char *a)/* Pay the elements in the stack in reverse order to a/*
{int n=s.length-1;
while (! Stackempty (S))
GetTop (&s,&a[n--]);
}
void control (Stack *s)
{int i=0,k,j=0;
Selemtype ch,*a;
K=strlen (PASSWORD);
printf ("Enter a password of%d number, you only have 3 chances: \ n", K);
printf ("c:\\>");
for (;;)
{if (i>=3)
{i++;
CLRSCR ();
Gotoxy (1,1); /* Position black screen cursor position * *
Break
}
else if (i>0&&i<3)
{Gotoxy (5,2);
For (j=1;j<= (*s)->length;j++) printf ("");
Gotoxy (5,2); Clearstack (s);}
for (;;)/* Password input, can be backspace * *
{Ch=getch ();/* BACKSPACE ASCII is 8 */
if (ch!=13)/* To determine whether to enter, not to pay it below * * *
{if (ch==8) {Pop (s); Gotoxy (4+j,2);p rintf (""); Gotoxy (4+j,2);}
else {printf ("*"); Push (s,ch);}
j= (*s)->length;}
else break;
}
i++;
if (k!=j) continue;
Else
{a= (Selemtype *) malloc ((*s)->length*sizeof (Selemtype));
Change (**s,a);
For (j=1;j<= (*s)->length;)
{if (a[j-1]==password[j-1]) j + +;
else {j= (*s)->length+2;break}}
if (j== (*s)->length+2) continue;
else break;}} /* The top for end * *
if (i==4) printf ("\ n password error, imminent exit");
else printf ("\ n password is correct \");
Free (a);
}
Main ()
{Stack s;
CLRSCR ()/* Clear Screen * *
Initstack (&s);
Control (&s);
Getch ();
Destroystack (&s);
}