11_33.cpp

C++语言程序设计案例教程,郑莉编的书

#include <iostream>
#include <fstream>
using namespace std;
class CStudent
{	struct student 
     {  char name[20];	
        char gender;		
        int age;		
        float avescore;
	}srec;
	fstream file;
public:
	CStudent();
	~CStudent();
	void appendfile();
};
CStudent::CStudent()
{	file.open("student.bin",ios::out|ios::binary);
	if(file.fail())	{	cout<<"can not create file"<<endl;		return;	}
	file.seekg(0,ios::end);
}
CStudent::~CStudent(){	file.close();}
void CStudent::appendfile()
{	char yn;	cout<<"Append the next record?(Y/N)?";	cin>>yn;
	while(yn=='Y'||yn=='y')
	{	cout<<"Name:(use ; to end)";
		for(int i=0;i<20;i++){cin>>srec.name[i];	if(srec.name[i]==';')	break;	}
		srec.name[i]='\0';
		cout<<"gender(m/f):";		cin>>srec.gender;
		cout<<"Age:";			cin>>srec.age;
		cout<<"Average score:";		cin>>srec.avescore;
		file.write((char*)&srec,sizeof(srec));
		cout<<"To input next record?(Y/N)";		cin>>yn;
	}
}
void main(){	CStudent student;	student.appendfile();}