flag45 链栈的书写以及规范性问题

# include <stdio.h>
# include <malloc.h>
typedef struct node
{
int  data;
struct node* next;
}Node,*Pnode;
typedef struct stu
{
Pnode base;
Pnode top,bottom;
}Base,*Pbase;
bool isempty(Pbase S);
void init(Pbase S);
void push(Pbase S,int val);
void pop (Pbase S,int* val);
void bianli(Pbase S);
int main()
{
int val;
Base S;
init (&S);
push(&S,1);
push(&S,2);
push(&S,3);
push(&S,4);
pop(&S,&val);
printf("%d \n",val);
bianli(&S);
return 0;
}
void init(Pbase S)
{
S->base=(Pnode)malloc(sizeof(Node));
S->bottom=S->base;
S->top=S->base;
}
void push(Pbase S,int val)
{
Pnode pnew=(Pnode)malloc(sizeof(Node));
pnew->data=val;
pnew->next=S->top;
S->top=pnew;
}
void pop (Pbase S,int* val)
{
if(!isempty(S))
{
*val=S->top->data;
Pnode r=S->top;
S->top=S->top->next;
free(r);
}
}
bool isempty(Pbase S)
{
if(S->bottom==S->top)
return true;
else return false;
}
void bianli(Pbase S)
{
Pnode L=S->top;
while(L!=S->bottom)
{
printf("%d ",L->data);
L=L->next;
}
printf("\n");
}