文章目录
顺序栈
代码如下:
using namespace std;
typedef int Status; //返回状态
//顺序表结构体
struct SqStack
{
char *base;
char *top;
int StackSize;
};
//初始化顺序栈
Status InitStack(SqStack &S)
{
S.base = new char[MAXSIZE];
if (!S.base)
{
Sleep(3000);
exit(OVER);
}
S.top = S.base;
S.StackSize = MAXSIZE;
return OK;
}
//入栈
Status Push(SqStack &s, char &e)
{
if (s.top - s.base == s.StackSize)
{
return ERROR;
}
*(s.top) = e; //元素入栈,栈顶指针+1
s.top++;
return OK;
}
//出栈
Status Pop(SqStack &s, char &e)
{
if (s.base == s.top)
{
return ERROR;
}
e = *(s.top - 1); //这是出栈元素
s.top--;
return OK;
}
//得到栈顶元素
char GetTop(SqStack &s)
{
if (s.top != s.base)
{
return *(s.top - 1);
}
}
//打印栈元素
void PrintStack(SqStack &s)
{
if (s.top != s.base)
{
cout << "栈的元素为:";
int k = 0;
for (int i = (s.top - s.base); i > 0; i--)
{
cout << *(s.top - 1) << " ";
--s.top;
k++;
}
for (int j = 0; j <k; j++)
{
++s.top;
}
}
}
int main()
{
SqStack s;
InitStack(s);
int n;
cout << "请输入初始个数:";
cin >> n;
cout << "请输入元素:" << endl;
for (int i = 0; i < n; i++)
{
char p;
cin >> p;
Push(s, p);
}
PrintStack(s);
cout << "栈顶为:" << GetTop(s) << endl;
char p1;
Pop(s, p1);
cout << "出栈后";
PrintStack(s);
return 0;
}
结果如下:
链栈
代码如下:
using namespace std;
typedef int Status; //返回状态
typedef struct StackNode
{
char date;
StackNode *next;
}*LinkStack;
//初始化链栈
Status InitStack(LinkStack s)
{
s = NULL;
return OK;
}
//入栈
Status Push(LinkStack s, char e)
{
LinkStack p;
p = new StackNode;
p->date = e;
p->next = s;
s = p;
return OK;
}
//出栈
Status Pop(LinkStack s, char &e)
{
LinkStack p;
if (s == NULL)
{
return ERROR;
}
e = s->date;
p = s; //用p临时保存栈顶元素的值
s = s->next; //修改栈顶指针
delete p;
return OK;
}
//取栈顶元素的值
char Getchar(LinkStack s)
{
if (s!=NULL)
{
return s->date;
}
cout << "栈为空,无法取栈顶元素!" << endl;
return ERROR;
}
int main()
{
StackNode s;
InitStack(&s);
char a, b, c;
a = 'c', b = 'b', c = 'a';
Push(&s, a);
Push(&s, b);
Push(&s, c);
cout << "出栈前栈顶为:";
Getchar(&s);
char e;
Pop(&s,e);
cout << "出栈后栈顶为:";
return 0;
}
结果如下: