C++是一种面向对象的编程语言，它的设计目标是提高程序的效率和可靠性。C++的一个重要特点是支持多重继承和运算符重载，这使得程序员可以更加灵活地编写程序。下面是一个简单的C++系统源代码示例。

#include<iostream>
#include<conio.h>
#include<fstream>
#include<ctype.h>
#include<iomanip>
using namespace std;
class book
{
int bno;
char bname[50];
char aname[20];
public:
void create_book()
{
cout<<"\nNEW BOOK ENTRY...\n";
cout<<"\nEnter The book number:";
cin>>bno;
cin.ignore();
cout<<"\n\nEnter The Name of The Book:";
cin.getline(bname,50);
cout<<"\nEnter The Author's Name:";
cin.getline(aname,20);
cout<<"\n\nBook Created...";
}
void show_book()
{
cout<<"\nBook number:"<<bno;
cout<<"\nBook Name:"<<bname;
cout<<"\nAuthor Name:"<<aname;
}
void modify_book()
{
cout<<"\nBook number:"<<bno;
cout<<"\nModify Book Name:";
cin.getline(bname,50);
cout<<"\nModify Author's Name of Book:";
cin.getline(aname,20);
}
char* retbname(){return bname;}
int retbno(){return bno;}
};
fstream fp;
book bk;
void write_book()
{
fp.open("book.dat",ios::out|ios::app);
bk.create_book();
fp.write((char*)&bk,sizeof(book));
fp.close();
cout<<"\n\nThe book Has Been Created...";
getch();
}
void display_allb()
{
system("cls");
cout<<"\n\n\n\tBook LIST\n\n";
cout<<"====================================================\n";
cout<<"Book Number"<<setw(10)<<"Book Name"<<setw(20)<<"Author\n";
cout<<"====================================================\n";
fp.open("book.dat",ios::in);
while(fp.read((char*)&bk,sizeof(book)))
{
bk.show_book();
cout<<"\n";
}
fp.close();
getch();
}
void modify_book()
{
int bn,found=0;
system("cls");
cout<<"\n\n\tMODIFY BOOK REOCORD.... ";
cout<<"\n\n\tEnter The book number:";
cin>>bn;
fp.open("book.dat",ios::in|ios::out);
while(fp.read((char*)&bk,sizeof(book)) && found==0)
{
if(bk.retbno()==bn)
{
bk.show_book();
cout<<"\nEnter The New Details of book"<<endl;
bk.modify_book();
int pos=-1*sizeof(bk);
fp.seekp(pos,ios::cur);
fp.write((char*)&bk,sizeof(book));
cout<<"\n\n\t Record Updated...";
found=1;
}
}
fp.close();
if(found==0)
cout<<"\n\n Record Not Found...";
getch();
}
void display_spb(int n)
{
system("cls");
cout<<"\nBOOK DETAILS\n";
int flag=0;
fp.open("book.dat",ios::in);
while(fp.read((char*)&bk,sizeof(book)))
{
if(bk.retbno()==n)
{
bk.show_book();
flag=1;
}
}
fp.close();
if(flag==0)
cout<<"\n\nBook does not exist";
getch();
}
void delete_book()
{
int bn;
system("cls");
cout<<"\n\n\n\tDELETE BOOK...";
cout<<"\n\nEnter The Book's number You Want To Delete:";
cin>>bn;
fstream fp2;
fp.open("book.dat",ios::in|ios::out);
fp2.open("Temp.dat",ios::out);
fp.seekg(0,ios::beg);
while(fp.read((char*)&bk,sizeof(book)))
{
if(bk.retbno()!=bn)
{
fp2.write((char*)&bk,sizeof(book));
}
}
fp2.close();
fp.close();
remove("book.dat");
rename("Temp.dat","book.dat");
cout<<"\n\n\tRecord Deleted ..";
getch();
}
void menu()
{
system("cls");
fp.open("book.dat",ios::in);
if(!fp)
{
cout<<"ERROR!!! FILE COULD NOT BE OPEN\n\n\n Go To Entry Menu to create File";
cout<<"\n\n\n Program is closing ....";
getch();
exit(0);
}
cout<<"\n\n\n\t\tMAIN MENU\n\n";
cout<<"\n\n\t1.CREATE BOOK RECORDS\n";
cout<<"\n\n\t2.DISPLAY ALL BOOKS RECORD\n";
cout<<"\n\n\t3.SEARCH BOOK RECORD ";
cout<<"\n\n\t4.MODIFY BOOK RECORD";
cout<<"\n\n\t5.DELETE BOOK RECORD";
cout<<"\n\n\t6.EXIT";
cout<<"\n\n\tPlease Enter Your Choice (1-6) ";
char ch;
cin>>ch;
switch(ch)
{
case '1':write_book();break;
case '2':display_allb();break;
case '3':
{
int num;
system("cls");
cout<<"\n\n\tPlease Enter The Book's Number: ";
cin>>num;
display_spb(num);
}break;
case '4':modify_book();break;
case '5':delete_book();break;
case '6':exit(0);
default:cout<<"\a";menu();
}
}
int main()
{
menu();
return 0;
}

在这段源代码中，定义了一个C++类`book`，这个类有三个属性，即书籍编号(`bno`)、书名(`bname`)和作者(`aname`)。这个类有四个方法，分别用于创建一本新的书籍、显示一本书籍的信息、修改一本书籍的信息和返回书名的方法。这个程序还包括了写入书籍信息到文件、从文件读取并显示所有书籍信息、根据书籍编号查找并显示一本书籍的信息、修改一本书籍的信息、删除一本书籍的信息以及菜单管理程序的方法。这个程序可以方便地管理一本书店的书籍，可以实现增加、修改、查找和删除书籍等功能，适用于初学C++的编程爱好者进行学习和使用。

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