从文件中读取作者和书籍信息，存入multimap,使用find查找指定作者并删除

最新推荐文章于 2024-04-08 08:34:51 发布

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最新推荐文章于 2024-04-08 08:34:51 发布

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分类专栏： C++ 文章标签： C++ map

本文链接：https://blog.youkuaiyun.com/simple_on_foot/article/details/13502629

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本文介绍了一个使用C++实现的简单程序，该程序利用标准模板库中的multimap来存储并管理作者与书籍的关系。具体操作包括从文件读取数据、展示存储的信息、删除指定作者的所有书籍记录，并再次展示更新后的信息。

#include <iostream>
#include <fstream>
#include <string>
#include <map>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	ifstream input("inputfile.txt");
	string author,bookname;
	multimap<string,string> bookInfo;
	//将文件中信息读入multimap
	while (input>>author>>bookname) {
		bookInfo.insert(make_pair(author, bookname));
	}
	input.clear();
	input.close();

	//显示信息
	cout<<"****************************************"<<endl;
	cout<<"The author and the book table "<<endl;
	multimap<string,string>::const_iterator beginIter = bookInfo.begin();
	multimap<string,string>::const_iterator endIter = bookInfo.end();
	for ( ; beginIter != endIter; ++beginIter) {
		cout<<"The name :"<<beginIter->first<<"\t\t"<<"The book :"<<beginIter->second<<endl;
	}
	cout<<"****************************************"<<endl;

	//删除指定作者的相关信息
	string findAuthor;
	cout<<"Please input the delete author : ";
	while (cin >> findAuthor) {
		int delNum = 0;
		multimap<string,string>::const_iterator mulIter = bookInfo.find(findAuthor);
		if (mulIter != bookInfo.end()) {
			delNum = bookInfo.erase(mulIter->first);
		}
		cout<<"The delete number is "<<delNum<<endl;

		//打印删除后信息
		cout<<"****************************************"<<endl;
		cout<<"After delete,the author and the book table "<<endl;
		multimap<string,string>::const_iterator beginIter = bookInfo.begin();
		multimap<string,string>::const_iterator endIter = bookInfo.end();
		for (; beginIter != endIter; ++beginIter) {
			cout<<"The name :"<<beginIter->first<<"\t\t"<<"The book :"<<beginIter->second<<endl;
		}
		cout<<"****************************************"<<endl;
		cout<<"Please input the delete author : ";
	}
	return 0;
}

保存信息的文件inputfile.txt

'em them
cuz because
gratz grateful
i I
nah no
pos supposed
sez said
tanx thanks
wuz was
nah no
pos supposed
sez said
tanx thanks
wuz was
nah no
pos supposed
sez said
tanx thanks
wuz was