LIFO栈 ADT接口 链表实现

LIFO 链栈结构

typedef int ElemType;
struct node{
    ElemType data;
    struct node* next;
};
typedef struct node* Stack;

LIFO 链栈基本操作

//LIFO 链栈初始化
void InitStack(Stack top){
     top = NULL;
}

//LIFO 链栈判断栈空
boolean StackKEmpty(Stack top){
     if(top == NULL) return true;
     else return false;
｝

//LIFO 链栈进栈
void Push(Stack top, ElemType x){
     LinkedStack p;
     p = malloc(sizeof *p);
     p -> data =x;
     p -> next = top;
     top = p;
}

//LIFO 链栈出栈
ElemType Pop(Stack top){
     LinkedStack p;
     ElemType x;
     if(top == NULL){
        printf("栈下溢错误!
");
        exit(1);
     }
     p = top;
     x = p -> data;
     top = top -> next;
     free(p);
     return x;
}

//LIFO 链栈读取栈顶
ElemType GetTop(Stack top){
     if(top == NULL){
        printf("栈下溢错误! 
");
        exit(1);
     }
     return top -> data;
}