第二十一章流 7二进制文件和文本文件 简单

// 第二十一章流 7二进制文件和文本文件
//1 以文本形式输出到文件
/*
#include <iostream>
#include <fstream>
using namespace std;
//定义一个结构体people
const int num=20;
struct people
{
    char name[num];
	double weight;
	int tall;
	int age;
	char sex;
};
int main()
{
	people pe={"李能",78.5,181,25,'f'};
	ofstream fout("people.dat",ios::out|ios::app); //打开.dat,用out或app方法

	fout<<pe.name<<" "<<pe.age<<" "<<pe.sex<<" "<<pe.tall<<" "<<pe.weight<<" "<<"\n";
	fout.close();

	ifstream fin("people.dat");
	char ch[255];
	fin.getline(ch,255-1,0);
	cout<<ch;
	fin.close();
    return 0;
}
*/

//2 以二进制形式输出到文件
//假如我们换成以二进制形式输出，那么我们可以将第16地和第17行换下面的语句
//ofstream fout("people.dat",ios::binary)
//fout.write((char*)&pe, sizeof pe);
/*#include <iostream>
#include <fstream>
using namespace std;
//定义一个结构体people
const int num=20;
struct people
{
    char name[num];
	double weight;
	int tall;
	int age;
	char sex;
};
int main()
{
	people pe={"李能",78.5,181,25,'f'};
	ofstream fout("people.txt",ios::binary);
	fout.write((char*)&pe,sizeof pe);
	fout.close();

	people pe1={"张玲",78.5,181,26,'f'};
	ifstream fin("people.txt",ios::binary);
	fin.read((char*)&pe1,sizeof pe1); //这里是读取
	cout<<pe1.name<<" "<<pe1.age<<" "<<pe1.sex<<" "<<pe1.tall<<" "<<pe1.weight<<" "<<"\n";
	//fin.close();

    return 0;
}
*/