【数据结构】栈的应用--行编辑程序（c++）

#pragma once

#include <iostream>
#include <assert.h>
using namespace std;

template<class Type>
class SeqStack
{
public:
SeqStack(size_t sz = INIT_SZ);
~SeqStack();
public:
bool empty()const;
bool full()const;
void show()const;
bool push(const Type &x);
bool pop();
void gettop(Type &x);
int length()const;
void clear();
void destory();
void quit_system(Type &x);
private:
enum{ INIT_SZ = 64 };
Type *base;
int capacity;
int top;
};

template<class Type>
SeqStack<Type>::SeqStack(size_t sz = INIT_SZ)
{
capacity = sz > INIT_SZ ? sz : INIT_SZ;
base = new Type[capacity];
assert(base != NULL);
top = 0;
}

template<class Type>
SeqStack<Type>::~SeqStack()
{
destory();
}

// 判断栈是否满了
template<class Type>
bool SeqStack<Type>::full()const
{
return (top >= capacity);
}

// 判断是否为空栈
template<class Type>
bool SeqStack<Type>::empty()const
{
return (top == 0);
}

// 显示
template<class Type>
void SeqStack<Type>::show()const
{
if (top == 0)
{
cout << "the stack is empty!" << endl;
return;
}
for (int i = top - 1; i >= 0; --i)
{
cout << base[i] << endl;
}
}

// 入栈
template<class Type>
bool SeqStack<Type>::push(const Type &x)
{
if (full())
{
cout << "the stack is full,can not enter!" << endl;
return false;
}
else
{
base[top] = x;
top++;
return true;
}
}

// 出栈
template<class Type>
bool SeqStack<Type>::pop()
{
if (empty())
{
cout << "the stack is empty,can not pop!" << endl;
return false;
}
else
{
top--;
return true;
}
}

// 获得栈顶元素
template<class Type>
void SeqStack<Type>::gettop(Type &x)
{
x = base[top - 1];
}

// 求栈长度
template<class Type>
int SeqStack<Type>::length()const
{
return top;
}

// 清空栈
template<class Type>
void SeqStack<Type>::clear()
{
top = 0;
}

// 摧毁栈
template<class Type>
void SeqStack<Type>::destory()
{
delete[]base;
base = NULL;
capacity = top = 0;
}

// 退出系统
template<class Type>
void SeqStack<Type>::quit_system(Type &x)
{
x = 0;
}

#include "Edlin.h"

int main()
{
SeqStack<char> mystack;
char ch;
cout << "please enter:" << endl;
cout << "*  @:delete all    $:delete one  *" << endl;
while ((ch = getchar()) != EOF)
{
switch (ch)
{
case '@':
mystack.clear();
cout << "please enter:" << endl;
break;
case '$':
mystack.pop();
break;
default:
mystack.push(ch);
break;
}
}
mystack.show();
return 0;
}