【資料結構】棧的應用--括號的匹配（c++）

標頭檔案：

#pragma once

#include <iostream>
#include <assert.h>
#include <string.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 = 20 };
	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();
}

// 判斷棧是否滿了
template<class Type>
bool SeqStack<Type>::full()const
{
	return (top >= capacity);
}

// 判斷是否為空棧
template<class Type>
bool SeqStack<Type>::empty()const
{
	return (top == 0);
}

// 顯示
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;
	}
}

// 入棧
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;
	}
}

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

// 獲得棧頂元素
template<class Type>
void SeqStack<Type>::gettop(Type &x)
{
	x = base[top - 1];
}

// 求棧長度
template<class Type>
int SeqStack<Type>::length()const
{
	return top;
}

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

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

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

主函式：

#include "stack.h"

bool Check(const char *str)
{
	SeqStack<char> mystack;
	char value;
	mystack.push('#');
	while (*str != '\0')
	{
		if (*str == ')')
		{
			mystack.gettop(value);
			if (value == '(')
			{
				mystack.pop();
			}
			else
			{
				return false;
			}
		}
		else if (*str == ']')
		{
			mystack.gettop(value);
			if (value == '[')
			{
				mystack.pop();
			}
			else
			{
				return false;
			}
		}
		else
		{
			mystack.push(*str);
		}
		str++;
	}
	mystack.pop();
	return mystack.empty();
}

int main()
{
	char *str = "[(()[])]";
	bool flag = Check(str);
	if (flag)
	{
		cout << "OK" << endl;
	}
	else
	{
		cout << "Error" << endl;
	}
	return 0;
}