【数据结构】C语言栈的基本操作

#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
//定义节点
struct Node
{
    int data;
    struct Node *next;
};
typedef Node StackNode;
//定义栈
 struct Stack
{
    StackNode *top;
    StackNode *base;
};
 typedef Stack SqStack;
 //定义创建栈的函数
 int InitStack(SqStack *S)
 {
     S->base = (StackNode*)malloc(sizeof(Node));
     if (!S->base)
     {
         printf("error");
         exit();
     }
     S->top = S->base;
     S->top->next=NULL;
     return ;
 }
 //定义压栈函数
 int PushStack(SqStack *S)
 {
     int e;
     StackNode *ps;
     ps = (StackNode *)malloc(sizeof(Node));
     if (!ps)
     {
         printf("error");
         exit();
     }
     printf("请输入你需要压入栈的数：");
     scanf_s("%d", &e);
     ps->data = e;
     ps->next = S->top;
     S->top = ps;
     return ;
 }
 //定义弹栈函数
 int PopStack(SqStack *S)
 {
     int e;
     StackNode *ps;
     ps = S->top;
     S->top = S->top->next;
     e = ps->data;
     free(ps);
     return e;
 }
 //定义栈遍历函数
 int TravelStack(SqStack *S)
 {
    StackNode *ps;
    ps = S->top;
     while (ps != S->base)
     {
         printf("数据为：%d\n", ps->data);
         ps = ps->next;
     }
     return ;
 }
 //定义判断栈是否为空函数
 bool EmptyStack(SqStack *S)
 {
     StackNode *ps;
     ps = S->top;
     if (ps == S->base)
     {
         return true;
     }
     else
     {
         return false;
     }
 }
 //定义清空栈的函数
 int ClearStack(SqStack *S)
 {
     StackNode *ps;
     ps = S->top;
     while (S->top != S->base)
     {
         S->top = S->top->next;
         free(ps);
     }
     return ;
 }
 //主函数
 int main()
 {
     int i,dec,input,DEC;
     SqStack *stack;
     stack = new Stack;
     InitStack(stack);
     do{
         printf("请选择你需要的基本操作：\n");
         printf("1************往栈中加入数据\n");
         printf("2************遍历该栈\n");
         printf("3************清空该栈\n");
         printf("4************删除栈顶元素\n");
         scanf_s("%d", &i);
         switch (i)
         {
         case :
         {
             printf("是否想往栈中输入数据？是选择1/否选择2\t");
             scanf_s("%d", &dec);
             while (dec == )
             {
                 PushStack(stack);
                 printf("是否继续输入数据？是选择1/否选择2\t");
                 scanf_s("%d", &input);
                 dec = input;
             }
             printf("你输入的数据为：\n");
             TravelStack(stack);
             break;
         }
         case :
         {
             TravelStack(stack);
             break;
         }
         case :
         {
             ClearStack(stack);
             if (EmptyStack(stack))
             {
                 printf("该栈已经空！");
             }
             else
             {
                 printf("该栈不为空！");
             };
             break;
         }
         case :
         {
             int ReturnData;
             ReturnData = PopStack(stack);
             break;
         }
         }
         printf("是否要继续？是选择1/否选择2：\t");
         scanf_s("%d", &DEC);
     } while (DEC == );
 }