dictionary.cpp

这是一个实现英汉字典的基本操作的代码。功能有：查询

#include<fstream.h>
#include<string.h>
#include<iomanip.h>
#include"Dictionary.h"

Dictionary::Dictionary()
{
	danci=NULL;
	num=0;
	return;
}

Dictionary::~Dictionary()
{
	if(danci!=NULL)
	   delete danci;
	return;
}

int Dictionary::LineCount(ifstream in)   //统计文件的行数
{
	int counter=0;
	char buf[225];
	while(!in.eof())
	{
		in.getline(buf,sizeof(buf));       //把文件中一行的数据放入数组buf中
		counter++;
	}
	return counter;
}

BOOLEAN Dictionary::init()       //初始化数据成员
{
	ifstream input_file;
	int loop;
	input_file.open("dic_file.txt");
	if(!input_file)
	{
		cout<<"该文件打开不成功！"<<endl;
		return FALSE;
	}
	num=LineCount(input_file);
    danci=new word[num];          
    input_file.seekg(0,ios::beg);     //文件的读指针重新指向文件开始
    for(loop=0;loop<num;loop++)        
		input_file>>(danci+loop)->English>>(danci+loop)->cixing>>(danci+loop)->Chinese;
	input_file.close();
	return TURE;
}

int Dictionary::Index(char* s,char* t)      //若t为s的子串，则返回t的第一个字符在s中的位置；
{                                           //否则，返回0
	int pos,length_s,length_t,i,j;
	length_s=strlen(s);
	length_t=strlen(t);
	if(length_s>=length_t)
	{
		i=0;
	    j=0;
		while(i<=length_s-1&&j<=length_t-1)
		{
			if(s[i]==t[j])           //继续比较后继字符
			{
				i++;
				j++;
			}
			else                     //指针后退重新开始匹配
			{
				i=i-j+1;
				j=0;
			}
		}
		if(j>=length_t)
			pos=i-length_t+1;
		if(j<length_t)
			pos=0;
	}
	else
		pos=0;
	return pos;
}

void Dictionary::SelectEnglish()       //根据英文单词查询其词性和中文解释
{
	char* string;
	int loop,temp=0;
	string=new char[MAXSTR];
	cout<<"请输入要查找的单词："<<endl;
	cin>>string;
	for(loop=0;loop<num;loop++)            //顺序查找与输入相同的单词
	{
		if(strcmp(string,(danci+loop)->English)==0)
		{
			cout<<danci+loop;                  //调用了重载的插入符   
			break;
		}
		temp++;
	}
	if(temp==num) 
			cout<<"该单词在词典中不存在."<<endl;
	delete string;
	return;
}

void Dictionary::SelectChinese()       //根据中文查询其英文和词性
{
	char* string;
	int loop,i,j,temp=0;
	char ch;
	string=new char[MAXSTR];
	cout<<"请输入中文："<<endl;
	cin>>string;   
	for(loop=0;loop<num;loop++)        //顺序查找包含了输入的中文
	{
		i=Index((danci+loop)->Chinese,string);    //调用函数Index()
		if(i)
		{
			j=i+strlen(string)-1;                //j是string的最后一个字符在某单词中的位置
			ch=(danci+loop)->Chinese[j];
			if((i==1&&ch==';')||(i==1&&ch=='\0')||(i!=1&&(danci+loop)->Chinese[i-2]==';'&&ch==';')||(i!=1&&(danci+loop)->Chinese[i-2]==';'&&ch=='\0'))
				temp++;
		}
	}
	if(temp==0)
		cout<<"词典里没有对（"<<string<<"）的英文解释"<<endl;
	else
	{
		cout<<setw(6)<<"英文解释"<<setw(15)<<"词性"<<endl;
		for(loop=0;loop<num;loop++)
		{
			i=Index((danci+loop)->Chinese,string);
		    if(i)
			{
				j=i+strlen(string)-1;                //j是string的最后一个字符在某单词中的位置
			    ch=(danci+loop)->Chinese[j];
			    if((i==1&&ch==';')||(i==1&&ch=='\0')||(i!=1&&(danci+loop)->Chinese[i-2]==';'&&ch==';')||(i!=1&&(danci+loop)->Chinese[i-2]==';'&&ch=='\0'))
					cout<<setw(6)<<(danci+loop)->English<<setw(15)<<(danci+loop)->cixing<<endl;
			}
		}
	}
	delete string;
	return;
}
		
int Dictionary::Add()             //添加一条记录，若成功添加则返回1，否则返回0
{
	word *str,*m;
	int loop,temp=0;
	str=new word;
	if(num<MAXSIZE)
	{
        cout<<"请输入新单词："<<endl;
	    cin>>str->English;
		for(loop=0;loop<num;loop++)     //查看是否有与输入相同的单词
		{
			 if(strcmp(str->English,(danci+loop)->English)==0)
			    break;
			 temp++;
		}
        if(temp==num)                //若不存在，则添加在最后
		{
            cin>>str;          //调用了重载的提取符
			m=danci+num;
			m=new word;
		    strcpy((danci+num)->English,str->English);
	        strcpy((danci+num)->cixing,str->cixing);
		    strcpy((danci+num)->Chinese,str->Chinese);
		    num++;
		    cout<<"添加成功！"<<endl;
			delete str;
			return 1;
		}
		else
			cout<<"该单词在词典中已存在。"<<endl;
	}
	else 
		cout<<"词典已满，添加失败。"<<endl;
	delete str;
    return 0;
}

int Dictionary::Delete()              //删除记录，若成功删除则返回1，否则返回0
{
	char* string;
	int loop,temp=0,i;
	string=new char[MAXSTR];
	if(num>0)
	{
		cout<<"请输入要删除的单词："<<endl;
	    cin>>string;
	    for(loop=0;loop<num;loop++)         //顺序查找与输入相同的单词
		{
	        if(strcmp(string,(danci+loop)->English)==0)
			    break;
			 temp++;
		}
	    if(temp<num)               //若存在，则将其删除
		{
		    for(i=temp;i<num-1;i++)
			{
			    strcpy((danci+i)->English,(danci+i+1)->English);
		        strcpy((danci+i)->cixing,(danci+i+1)->cixing);
		        strcpy((danci+i)->Chinese,(danci+i+1)->Chinese);
			}
		    num--;              //记录数减1
			cout<<"删除成功！"<<endl;
			delete string;
			return 1;
		}
	    else
			cout<<"该单词在词典中不存在！"<<endl;
	}
	else 
		cout<<"词典已空。无法进行删除操作！"<<endl;
	delete string;
	return 0;
}

int Dictionary::Update()          //修改记录,若成功修改则返回1，否则返回0
{
    word* str;
	int loop,temp=0,j;
	str=new word;
	cout<<"请输入要修改的单词："<<endl;	  
	cin>>str->English;
	for(loop=0;loop<num;loop++)          //顺序查找与输入相同的单词
	{
		if(strcmp((danci+loop)->English,str->English)==0)
			break;
		temp++;
	}
	if(temp<num)            //若存在，则用新的词性和中文取代旧的
	{
		j=temp;
		cout<<"请输入新的词性："<<endl;
		cin>>str->cixing;
		cout<<"请输入新的中文解释："<<endl;
		cin>>str->Chinese;
		strcpy((danci+j)->cixing,str->cixing);
		strcpy((danci+j)->Chinese,str->Chinese);
		delete str;
		return 1;
	}
	else
		cout<<"该单词在词典中不存在！"<<endl;
	delete str;
	return 0;
}

void Dictionary::ImageSelect()           //查询以某一前缀开头的单词的词性和中文解释   
{
	char* string;
	int loop,temp=0,i;
	string=new char[MAXSTR];
    cout<<"请输入单词的前缀："<<endl;
	cin>>string;
	
	for(loop=0;loop<num;loop++)
	{
        i=Index((danci+loop)->English,string);
		if(i==1)
			temp++;
	}
	if(temp==0)
		cout<<"词典中不存在以"<<string<<"为前缀的单词."<<endl;
	else
	{
		cout<<"以"<<string<<"为前缀的单词显示如下："<<endl;
	    cout<<setw(6)<<"英文"<<setw(15)<<"词性"<<setw(15)<<"中文"<<endl;
		for(loop=0;loop<num;loop++)
		{
			i=Index((danci+loop)->English,string);           //调用函数Index()
		    if(i==1)
				cout<<setw(10)<<(danci+loop)->English<<setw(10)<<(danci+loop)->cixing<<setw(20)<<(danci+loop)->Chinese<<endl;
		}
	}
	delete string;
	return;
}

void Dictionary::Show()       //显示所有记录
{
	int loop;
	cout<<"词典所有记录显示如下："<<endl;
	cout<<setw(6)<<"英文"<<'\t'<<setw(15)<<"词性"<<'\t'<<setw(15)<<"中文"<<'\t'<<endl;
	for(loop=0;loop<num;loop++)        //顺序输出所有单词
	    cout<<setw(10)<<(danci+loop)->English<<'\t'<<setw(10)<<(danci+loop)->cixing<<'\t'<<setw(20)<<(danci+loop)->Chinese<<'\t'<<endl;
    return;
}

ostream& operator << (ostream& stream,word* w)          //重载插入符
{
	stream<<"该单词的词性为："<<endl;
	stream<<w->cixing<<endl;
	stream<<"该单词的中文解释为："<<endl;
	stream<<w->Chinese<<endl;
	return stream;
}

istream& operator >> (istream& stream,word* w)         //重载提取符
{
    cout<<"请输入该单词的词性："<<endl;
	stream>>w->cixing;
	cout<<"请输入该单词的中文解释："<<endl;
	stream>>w->Chinese;
	return stream;
}