C++流项目练习

按照指定格式读取文件

#include <iostream>
#include <string>
#include <fstream>
#include <Windows.h>

using namespace std;

int main(void)
{
	ifstream inFile;
	string line;
	char name[32];
	int age;
	inFile.open("user.txt");

	while (1)
	{
		getline(inFile, line);
		if (inFile.eof())
		{
			break;
		}

		sscanf_s(line.c_str(), "姓名:%s 年龄:%d", name, sizeof(name), &age);

		cout << "姓名：" << name << "\t\t年龄" << age << endl;
	}
	inFile.close();

	system("pause");
	return 0;

}

按照指定格式写文件

#include <string>
#include <iostream>
#include <sstream>
#include <fstream>

using namespace std;

int ereq(void)
{
	string name;
	int age;
	ofstream outFile;

	//打开文件
	outFile.open("user.txt");

	while (1)
	{
		cout << "请输入姓名:";
		cin >> name;

		if (cin.eof())
		{
			break;
		}

		cout << "请输入年龄:";
		cin >> age;

		stringstream s;
		s << "姓名:" << name << "\t\t\t年龄:" << age << endl;

		outFile << s.str();
	}

	outFile.close();

	system("pause");
	return 0;

}

 写文本文件

#include <iostream>
#include <string>
#include <fstream>
#include <Windows.h>

using namespace std;

int writeFile(void)
{
	string name;//姓名
	int age;//年龄
	ofstream outFile;

	//打开文件
	outFile.open("user.txt", ios::out | ios::trunc);

	while (1)
	{
		//输入姓名
		cout << "请输入姓名：";
		cin >> name;
		//判断是否输入
		if (cin.eof())
		{
			break;
		}

		outFile << name << "\t";

		//输入年龄
		cout << "请输入年龄：";
		cin >> age;
		outFile << age << endl;
		
	}

	outFile.close();

	system("pause");
	return 0;
}

读文本文件

#include <iostream>
#include <Windows.h>
#include <string>
#include <fstream>

using namespace std;

int readFile(void)
{
	string name;
	int age;
	ifstream outFile;

	outFile.open("user.txt");

	while (1)
	{
		outFile >> name;
		if (outFile.eof())
		{
			break;
		}

		cout << name << "\t";

		outFile >> age;
		cout << age << endl;

	}

	outFile.close();

	system("pause");
	return 0;
}

二进制读文件

#include <iostream>
#include <string>
#include <fstream>
#include <Windows.h>

using namespace std;

int er(void)
{
	ifstream inFile;
	string name;
	int age;

	inFile.open("user.dat", ios::in | ios::binary);

	while (1)
	{
		inFile >> name;
		if (inFile.eof())
		{
			break;
		}
		cout << name;

		char tmp;
		inFile.read(&tmp, sizeof(tmp));
		
		inFile.read((char*)&age, sizeof(age));
		cout << age << endl;
	}

	inFile.close();

	system("pause");
	return 0;
}

二进制写文件

#include <iostream>
#include <string>
#include <fstream>
#include <Windows.h>

using namespace std;

int erOutFile(void)
{
	ofstream outFile;
	string name;
	int age;

	outFile.open("user.dat", ios::out | ios::trunc | ios::binary);

	while (1)
	{
		cin >> name;
		outFile << name;
		if (cin.eof())
		{
			break;
		}

		cin >> age;
		outFile.write((char*)&age, sizeof(age));

	}

	outFile.close();

	system("pause");
	return 0;
}