C语言实现栈的进栈与出栈、输出栈顶元素、元素个数、销毁栈

 /********************************引入头文件**************************************************/ 
#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>

/**********************************定义*******************************************************/ 
/*定义状态码*/  
#define OK 0            //正常 
#define ERROR -1        //出错 
#define OVERFLOW -2        //内存申请不成功    
#define DEFSIZE 10      //栈的默认大小 
#define INCREAMSIZE 10     //每次当栈空间满时，增量 
/* 定义结构体 */
typedef int Status;     //定义状态     
typedef int ElemType;      //定义栈内元素类型

//定义栈的的数据结构 
typedef struct{
    ElemType *base;     //栈底指针 
    ElemType *top;        //栈顶指针 
    int stackSize;        // 栈大小 
    int realSize;        // 栈当前大小,可以不定义 
}SqStack; 

/*********************************stack操作方法**************************************************/

//初始化一个栈
Status InitStack(SqStack &sqstack)
{
    //申请默认栈大小 
    sqstack.base = (ElemType*)malloc(DEFSIZE*sizeof(ElemType)); 
    if(!sqstack.base) exit(OVERFLOW);
    
    sqstack.top  = sqstack.base;
    sqstack.stackSize = DEFSIZE;
    sqstack.realSize = 0; 
    return OK;
}

//进栈
Status Push(SqStack &sqstack,ElemType &e)
{
    if(sqstack.top-sqstack.base>=sqstack.stackSize)
	{
        sqstack.base = (ElemType*)realloc(sqstack.base,(sqstack.stackSize+INCREAMSIZE)*sizeof(ElemType)); 
        //如果申请失败返回溢出 
        if(!sqstack.base) exit(OVERFLOW);
        sqstack.top = sqstack.base + sqstack.stackSize;
        sqstack.stackSize = sqstack.stackSize + INCREAMSIZE;
    }
    *sqstack.top++ = e;
    sqstack.realSize++;
    return OK;
}

//出栈
Status Pop(SqStack &sqstack,ElemType &e)
{
    if(sqstack.base==sqstack.top)
	{
        exit(ERROR);
    }
    e = *--sqstack.top;
    sqstack.realSize--;
    return OK;
}

//得到栈顶元素 
Status GetTop(SqStack &sqstack,ElemType &e)
{
    if(sqstack.base==sqstack.top)
	{
        exit(ERROR);
    }
    e = *(sqstack.top-1);
    return OK;
}

//判断栈是否为空
bool IsEmpty(SqStack &sqstack)
{
    if(sqstack.realSize>0)
        return false;
    else
        return true;
} 

//销毁栈 
Status DestroyStack(SqStack &sqstack)
{
    sqstack.top = sqstack.base;
    free(sqstack.base);
    sqstack.realSize = 0;
    sqstack.stackSize = DEFSIZE; 
    return OK;
} 
 
//得到栈的元素个数 
int StackLength(SqStack &sqstack)
{
    return sqstack.realSize;
} 

/*******************************主函数************************************************/
int main(int argc, char *argv[])
{ 
    
    SqStack sqstack;
    int N = 0;         //用于记录输入栈的个数 
    int temp = 0;    //用于临时存栈 
    
    /****初始化栈***/
    InitStack(sqstack);
    printf("初始化时，堆的大小为：%d\n",sqstack.stackSize);
    
    /**根据输入来填充栈**/
    printf("请入你想要输入几个数据进栈：");
    scanf("%d",&N) ;
    while(N--)
	{
        scanf("%d",&temp);
        Push(sqstack,temp);
        printf("进栈的大小为：%d\t",temp);
        printf("压栈后，栈的大小为：%d,%d\n",temp,sqstack.stackSize);
        
    } 
    /**得到栈顶元素**/
    GetTop(sqstack,temp);
    printf("得到栈顶元素为：%d",temp); 
    

    /**将栈的元素逐一出栈**/
/*    printf("现在开始逐一出栈：\n");
    while(!IsEmpty(sqstack)){
    //如果栈不为空则进行出栈 
        Pop(sqstack,temp);
        printf("%d \t",temp);
    } 
    printf("\n栈输出完成！！\n");
*/
    
    DestroyStack(sqstack);
    printf("销毁栈完成！！\n");
    scanf("%d",&temp);

    return 0;
}