【C++ Primer Plus习题】6.9

问题:

解答:

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

typedef struct _Donor
{
	string name;
	double money;
}Donor;

int main()
{
	ifstream file;
	string filename;
	int count = 0;
	cout << "请输入文件名:";
	getline(cin, filename);
	file.open(filename);
	if (!file.is_open())
	{
		cout << "文件打开失败!" << endl;
		exit(EXIT_FAILURE);
	}
	bool empty = true;;
	file >> count;
	Donor* donors = new Donor[count];
	file.get();
	for (int i = 0; i < count; i++)
	{
		getline(file, donors[i].name);
		file >> donors[i].money;
		file.get();
	}

	cout << "重要捐款人的信息如下:" << endl;
	for (int i = 0; i < count; i++)
	{
		if (donors[i].money >= 10000)
		{
			cout << donors[i].name << endl;
			empty = false;
		}
	}
	if (empty)
	{
		cout << "NONE" << endl;
	}

	cout << "普通借款人信息如下:" << endl;
	for (int i = 0; i < count; i++)
	{
		if (donors[i].money < 10000)
		{
			cout << donors[i].name << endl;
			empty = false;
		}
	}
	if (empty)
	{
		cout << "NONE" << endl;
	}

	return 0;
}

运行结果:

考查点:

• 文件的读入

注意:

• get()的用处