C语言实现顺序栈的初始化&进栈&出栈&读取栈顶元素

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/*顺序表实现栈的一系列操作*/ 

#include<stdio.h>
#include<stdlib.h> 

#define Stack_Size 50             //设栈中元素个数为50 
#define OK 1
#define ERROR 0

typedef struct                
{
	int elem[Stack_Size];          //用来存放栈中元素的一维数组 
	int top;	                   //用来存放栈顶元素的下标，top为 -1 表示空栈 
}SeqStack;

/**********************各个子函数的定义*********************/
int initStack(SeqStack *S);     	//初始化顺序栈 
void push(SeqStack *S,int n);  		//顺序栈进栈运算 
void pop(SeqStack *S);				//顺序栈出栈运算 
int getTop(SeqStack *S,int *s);     //读取栈顶元素 
 
int main()
{
	SeqStack *S;
	int choice;
	while(true)
	{
        printf("*****************Please enter your choice*****************\n\n");
        printf("                choice 1：Stack initialization\n");
        printf("                choice 2：Into the stack\n");
        printf("                choice 3：Out of the stack\n");
        printf("                choice 4：Read the stack elements\n");
        printf("                choice 0：exit\n\n");
	 	scanf("%d",&choice);
		switch(choice)
		{
			case 1:
				(initStack(S)==1)?printf("initStck success.\n"):printf("initStack ERROR\n");
				break;
			case 2:
				int n;
				printf("Please enter the number into the stack elements：");
				scanf("%d",&n);
				push(S,n);
				break;
			case 3:
				pop(S);
				break;
			case 4:
				int* s;
				(getTop(S,s)==1)? printf("栈顶元素是：%d.\n",*s):printf("An empty stack error!!!!\n"); //三目运算符
				break;		
			case 0:
				exit(0);
				break;
			default:
				printf("ERROR！！\n");
				exit(0);
				break;
		}
	}
	return 0;
} 

/**********************各个子函数功能的实现*********************/
int initStack(SeqStack *S)    //初始化顺序栈 
{	     
	if(S!=NULL)
	{
		S->top=-1;             //置为空栈 
		return OK;
	}
	else return ERROR;        //内存空间不足 
}
void push(SeqStack *S,int n)  //进栈 ，将元素压入栈中 
{   
	int n1,n2;
	if(((S->top)+n)<=Stack_Size-1)   //压入栈中的元素不能超过栈的最大存储 
	{  
		printf("Please enter into the stack elements in turn:\n");  
		for(n1=0;n1<n;n1++)
		{
			scanf("%d",&n2);
			S->top++;                    //移动栈顶指针 
			S->elem[S->top]=n2;
		}
		printf("%d个元素依次进栈成功\n",n);
	}
	else
	{                    //栈空间不够 
		printf("ERROR There is insufficient space on the stack.\n");            
	}                 
}
void pop(SeqStack *S)
{     //栈顶元素出栈 
	int a;
	if(S->top==-1)
	{               //栈为空，操作失败 
		printf("An empty stack error!!!!\n");
	}
	else
	{
		a=S->elem[S->top];
		S->top--;
		printf("栈顶元素%d出栈成功.\n",a);  //出栈成功 
	}  

}
int getTop(SeqStack *S,int *s)   //获取栈顶元素 
{    
	if(S->top==-1)
	{               //栈为空，操作失败 
		return ERROR;
	}
	else
	{
		*s=S->elem[S->top];   //读取栈顶元素成功 
		return OK;
	}
}