exam3-2.cpp

数据结构c++-书的一些源代码

#include <string.h>
#include <iostream.h>
#include <stdlib.h>

const MaxStackSize = 100;
typedef char DataType;
#include "SeqStack.h"

void ExpIsCorrect(char exp[], int n)
//判断有n个字符的字符串exp左右括号是否配对正确
{
	SeqStack myStack;					//定义链式堆栈
	int i;

	for(i = 0; i < n; i++)
	{
		if((exp[i] == '(') || (exp[i] == '[') || (exp[i] == '{'))
			myStack.Push(exp[i]);							//入栈
		else if(exp[i] == ')' && myStack.NotEmpty() 
			&& myStack.GetTop() == '(') 
			myStack.Pop(); 								//出栈
		else if(exp[i] == ')' && myStack.NotEmpty() 
			&& myStack.GetTop() != '(') 
			{
				cout << "左右括号配对次序不正确！" << endl;
				return;
			}
		else if(exp[i] == ']' && myStack.NotEmpty() 
			&& myStack.GetTop() == '[')
			myStack.Pop(); 								//出栈
		else if(exp[i] == ']' && myStack.NotEmpty() 
			&& myStack.GetTop() != '[')
			{
				cout << "左右括号配对次序不正确！" << endl;
				return;
			}
		else if(exp[i] == '}' && myStack.NotEmpty() 
			&& myStack.GetTop() == '{')
			myStack.Pop(); 								//出栈
		else if(exp[i] == '}' && myStack.NotEmpty() 
			&& myStack.GetTop() != '{')
			{
				cout << "左右括号配对次序不正确！" << endl;
				return;
			}
		else if(((exp[i] == ')') || (exp[i] == ']') || (exp[i] == '}')) 
				&& !myStack.NotEmpty())
		{
			cout << "右括号多于左括号！" << endl;
			return;
		}
	}

	if(myStack.NotEmpty())
		cout << "左括号多于右括号！" << endl;
	else
		cout << "左右括号匹配正确！" << endl;
}

void main(void)
{
	char a[] = "(())abc{[)(]}";		//测试例子1。注意：左右括号配对次序不正确
	int  n = strlen(a);
	ExpIsCorrect(a, n);

	char b[] = "(()))abc{[]}";		//测试例子2。注意：右括号多于左括号
	n = strlen(b);
	ExpIsCorrect(b, n);

	char c[] = "(()()abc{[]}";		//测试例子3。注意：左括号多于右括号
	n = strlen(c);
	ExpIsCorrect(c, n);

	char d[] = "(())abc{[]}";		//测试例子4。注意：左右括号匹配正确
	n = strlen(d);
	ExpIsCorrect(d, n);
}