c数据结构栈的基本操作（字符逆序输出）
线性栈
输入字符，再输出
#include "stdafx.h"
#include<stdlib.h>
#include<malloc.h>
#define STACK_SIZE 100
#define STACKINCREAMENT 10
#define ERROR 0
#define OK 1
#define OVERFLOW -2
typedef int SElemType;
typedef int Status;
typedef char CElemType;
//定义栈结构体
typedef struct Stack{
SElemType *base;
SElemType *top;
int stacksize;
}SqStack;
//函数声明
Status InitStack(SqStack &S);
CElemType Push(SqStack &S, char e);
CElemType PrintfStack(SqStack S);
CElemType PopStack(SqStack &S);
Status StackLength(SqStack S);
int main()
{
SqStack S;
InitStack(S);
int i, n;
char e;
printf("请输入需要输入数字的个数n=");
scanf_s("%d", &n);
for (i = 0; i < n; i++)
{
printf("第%d个字符为：",i+1);
scanf_s("\n%c", &e);
Push(S, e);
}
PrintfStack(S);
}
//构建新的空栈
Status InitStack(SqStack &S)
{
S.base = (SElemType*)malloc(STACK_SIZE*sizeof(SElemType));
if (!S.base)
return ERROR;
S.top = S.base;
S.stacksize = STACK_SIZE;
return OK;
}
//入栈操作
CElemType Push(SqStack &S, char e)
{
SElemType *p;
if (S.top - S.base >= S.stacksize)
{
S.base = (SElemType*)realloc(S.base, (STACK_SIZE + STACKINCREAMENT)*sizeof(SElemType));
if (!S.base)
exit(OVERFLOW);
p = S.base;
S.top = S.base + S.stacksize;
S.stacksize += STACKINCREAMENT;
}
*S.top++ = e;
return OK;
}
//输出栈中存储哪些元素
CElemType PrintfStack(SqStack S)
{
SElemType *p;
if (S.base == S.top)
{
printf("The Stack is Empty!!!\n");
return 0;
}
printf("栈顶先输出\n");
for (p = S.top - 1; p != S.base - 1; p--)
printf("%c ", *p); //从栈顶的元素最先输出
printf("\n");
}
//出栈操作
CElemType PopStack(SqStack &S)
{
if (S.base == S.top)
{
printf("The Stack is Empty!!!\n");
return OK;
}
printf("出栈的元素为%c\n", *(S.top - 1));
*(--S.top) = NULL;
}
//求栈的长度
Status StackLength(SqStack S)
{
printf("The Stack'length is %d !\n", S.top - S.base);
return OK;
}
