#include 
     
      #include 
      
       #define ElementType int//数据结构部分定义 typedef struct SNode *Stack;typedef struct SNode{	ElementType Data;	Stack Next;};Stack InitStack(){	Stack S = (Stack)malloc(sizeof(struct SNode));	S->Next=NULL;	return S;}bool Push(Stack &S, ElementType item){	Stack T = (Stack)malloc(sizeof(struct SNode));	T->Next = S->Next;	T->Data=item;	S->Next=T;	return true;}ElementType Pop(Stack &S){	if(S->Next==NULL){		printf("栈为空\n");		return NULL; 	}	Stack Tmp = S->Next;	ElementType X = Tmp->Data;	S->Next = Tmp->Next;	free(Tmp);	return X;}int main(){	Stack S = InitStack();	for(int i = 0; i<11;i++){		Push(S,i);	}		printf("%d\n",Pop(S));	printf("%d\n",Pop(S));	printf("%d\n",Pop(S));	return 0;}