C++是一门非常流行的编程语言，被广泛应用于各种领域，尤其是软件开发领域。图书馆管理系统是C++应用的一个重要领域之一，也是需要高效、可靠的程序实现的。

下面我们介绍一份C++图书馆管理系统的源代码，这份源代码基于C++语言编写，是一个较为完整的图书馆管理系统。

该系统的功能主要包括：添加图书、删除图书、查询图书、借阅图书、归还图书、图书管理等功能。

以下是该系统的源代码：

（代码中注释中的内容解释了源代码的作用）

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
struct st{ //图书结构体
  int bookID; //图书ID
  char bookName[100]; //图书名字
  char author[100]; //作者名字
  char publisher[100]; //出版社名字
  int publishYear; //出版年份
  int borrowTime; //借出时间
  int returnTime; //归还时间
  bool hasBorrowed; //是否借出
}book[100]; //图书数组
int cnt=0; //图书个数
void output(const st& x){ //输出一个图书
  printf("ID:%d Name:%s Author:%s Publisher:%s Publish Year:%d ",x.bookID,x.bookName,x.author,x.publisher,x.publishYear);
  if(x.hasBorrowed==1) printf("Has been borrowed. Borrow time:%d Return time:%d \n",x.borrowTime,x.returnTime);
  else printf("Hasn't been borrowed. \n");
  return;
}
int find(int _id){ //根据ID寻找图书,返回所在的编号，没有则返回-1
  int res=-1;
  for(int i=0;i<cnt;i++){
    if(book[i].bookID==_id) res=i;
  }
  return res;
}
void add(){ //添加图书
  if(cnt==100){printf("Sorry, the library is full.\n");return;}
  printf("Please input the book's name:");
  char tmp[100];
  cin>>tmp;
  strcpy(book[cnt].bookName,tmp);
  printf("Please input the book's author:");
  cin>>tmp;
  strcpy(book[cnt].author,tmp);
  printf("Please input the book's publisher:");
  cin>>tmp;
  strcpy(book[cnt].publisher,tmp);
  printf("Please input the book's publish year:");
  cin>>book[cnt].publishYear;
  book[cnt].hasBorrowed=0;
  book[cnt].borrowTime=book[cnt].returnTime=-1;
  book[cnt].bookID=cnt+1;
  cnt++;
  printf("Successfully added the book. The book's ID is %d.\n",cnt);
  return;
}
void del(){ //删除图书
  printf("Please input the ID of the book you want to delete:");
  int _id;
  cin>>_id;
  int pos=find(_id);
  if(pos==-1){printf("The book does not exsit.\n");return;}
  else{
    for(int i=pos;i<cnt-1;i++){
      book[i]=book[i+1];
      book[i].bookID--;
    }
    cnt--;
    printf("The book has been deleted.\n");
  }
  return;
}
void query(){ //查询图书
  printf("Please input the ID of the book you want to query:");
  int _id;
  cin>>_id;
  int pos=find(_id);
  if(pos==-1){printf("The book does not exsit.\n");return;}
  else output(book[pos]);
  return;
}
void borrow(){ //借出图书
  printf("Please input the ID of the book you want to borrow:");
  int _id;
  cin>>_id;
  int pos=find(_id);
  if(pos==-1){printf("The book does not exsit.\n");return;}
  else if(book[pos].hasBorrowed==1){printf("The book has been borrowed.\n");return;}
  else{ //借出图书
    book[pos].hasBorrowed=1;
    printf("Please input the borrow time:");
    cin>>book[pos].borrowTime;
    printf("Please input the return time:");
    cin>>book[pos].returnTime;
    printf("The book has been borrowed.\n");
  }
  return;
}
void getback(){ //归还图书
  printf("Please input the ID of the book you want to get back:");
  int _id;
  cin>>_id;
  int pos=find(_id);
  if(pos==-1){printf("The book does not exsit.\n");return;}
  else if(book[pos].hasBorrowed==0){printf("The book has not been borrowed.\n");return;}
  else{ //归还图书
    book[pos].hasBorrowed=0;
    book[pos].borrowTime=book[pos].returnTime=-1;
    printf("The book has been returned.\n");
  }
  return;
}
void menu(){ //输出主菜单
  printf("---------------------\nLibrary Manager\n---------------------\n");
  printf("1.Add a book.\n2.Delete a book.\n3.Query a book.\n4.Borrow a book.\n5.Get back a book.\n6.Manage books.\n7.Exit.\n");
  printf("---------------------\n");
  return;
}
int main(){
  while(1){
    menu();
    int opt;
    cin>>opt;
    if(opt==1) add();
    else if(opt==2) del();
    else if(opt==3) query();
    else if(opt==4) borrow();
    else if(opt==5) getback();
    else if(opt==6){
      printf("There are %d books in the library.\n",cnt);
      printf("Do you want to see all the books?('y' or 'n')\n");
      char tmp;
      cin>>tmp;
      if(tmp=='y'){
        for(int i=0;i<cnt;i++) output(book[i]);
      }
    }
    else if(opt==7) break;
    else printf("Invalid option.\n");
  }
  return 0;
}

总体来说，这份源代码相对比较简单，但基本实现了一个图书馆管理系统应有的功能。这份源代码能够帮助初学者了解C++编程语言的基本语法，并且能够对图书馆管理系统有一个相对完整的认识。由于代码长度较短，适合初学者进行边学边改进，不断提升代码质量和功能完整性。

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