资料库管理系统：代码清单.doc

SEMIIC+作业：资料库管理系统 代码清单1、在TC+中编写以下代码文件Library.CPP，并运行工程；#include #include #include #include / The base class for books in the library.class book_clprotected:int book_cd;char book_nm30;char publisher30;public:/* Function to accept the details common to both books and periodicals. It takes the last book code as a parameter. */void getdata(int lcd)char check;cout nntADD NEW BOOK/PERIODICAL DETAILS endl;book_cd=lcd+1;cout nnBook code: book_cd endl;/ Verify that the book name is not left blank.check=n;while(check=n)cout endl Enter Book/Periodical name: ;cin.getline(book_nm, 30);if(strlen(book_nm)=0)cout nntBook/Periodical name must be entered.;elsecheck=y;/ Verify that the publisher name is not left blank.check=n;while(check=n)cout nEnter Publisher name: ;cin.getline(publisher, 30);if(strlen(publisher)=0)cout nntPublisher name must be entered.;elsecheck=y;/ Function to display the details common to books and periodicals.void dispdata(void)cout nCode: book_cd;cout tName: book_nm;/ The derived class for books in the library.class book:public book_clprotected:char author_nm30;char pubdate8;float price;char status;public:/* Function to accept the book specific details. It takes the last book code as a parameter. */void getdata(int lcode)char check;/ Invoke the function in the base class.book_cl:getdata(lcode);/ Verify that the author name is not left blank.check=n;while(check=n)cout nEnter Author Name: ;cin.getline(author_nm, 30);if(strlen(author_nm)=0)cout nntAuthor name must be entered.;elsecheck=y;cout pubdate;cin.ignore();/ Verify that the price is greater than 0.check=n;while(check=n)cout price;cin.ignore();if(price=0)cout nntBook price must be greater than 0.;elsecheck=y;/ Set the new books status as available. status=A;/ Function to display the details specific to books.void dispdata(void)book_cl:dispdata();cout tAuthor: author_nm;/ Function that returns the book getcode(void)return book_cl:book_cd;/ Function to set the book status to the value received as a parameter.void setstatus(char pstatus)status=pstatus;/ Function that returns the book status.char getstatus(void)return status;/ The derived class for periodicals in the library.class periodical:public book_clprotected:char periodicity;public:/* Function to accept the periodical specific details. It takes the last periodical code as a parameter. */void getdata(int lcode)char check;/ Invoke the function in the base class.book_cl:getdata(lcode);/ Verify that a valid periodicity is entered.check=n;while(check=n)cout periodicity;if(periodicity=a & periodicity=z)periodicity=periodicity-32;if(periodicity!=F & periodicity!=M & periodicity!=S & periodicity!=Y)cout nntPeriodicity must be entered as F for Fortnightly, M for Monthly,S for Six-monthly, and Y for Yearly;elsecheck=y;/ Function that returns the book getcode(void)return book_cl:book_cd;/ Function that returns the book name.char *getname(void)return book_cl:book_nm;/ The class for periodical issues in the library.class perissueprotected:int percode;int issno;char issdate8;float price;char status;public:/* Function to accept the details of an issue for a periodical.It takes the periodical code and issue number as parameters. */void getdata(int pcode, int issuenum)char check;percode=pcode;issno=issuenum;cout issdate;/ Verify that the price is greater than 0.check=n;while(check=n)cout price;if(price=0)cout nntIssue price must be greater than 0.;elsecheck=y;/ Set the new issues status as available. status=A;/* Function to display the details of the issue. It takes the periodical name as a parameter. */void dispdata(char *fbooknm)cout nCode: percode;cout tName: fbooknm;cout tIssue: issno;cout tIssue date: issdate;/ Function that returns the issue getissno(void)return issno;/ Function that returns the periodical getpercd(void)return percode;/ Function that returns the availability status of the issue.char getstatus(void)return status;/ Function to set the issue status to the value received as a parameter.void setstatus(char pstatus)status=pstatus;void main(void)int choice=0;/ Function declarations.void addbook(void);void addper(void);void issueret(void);void delissue(void);void viewavail(void);/ Loop to display the menu.while(choice!=6)system(cls);cout nntLIBRARY MANAGEMENT SYSTEM;cout nn1. Add new Book details;cout n2. Add new Periodical details;cout n3. Record Issue/Return details;cout n4. Delete old Periodical Issue details;cout n5. View Available Books/Periodicals;cout n6. Exit;cout choice;cin.ignore();/ Check user input menu choice and invoke appropriate function.if(choice=1)addbook();else if(choice=2)addper();else if(choice=3)issueret();else if(choice=4)delissue();else if(choice=5)viewavail();else if(choice=6)return;elsecout nntINVALID CHOICE! Valid choices are 1 to 6.;/ Function to accept and add new book details to the Book.dat file.void addbook(void)/ Declare objects of the book class.book book1, book2;int lastcode;system(cls);/ Open Book.dat file for reading.fstream finout(Book.dat, ios:in);if(!finout)cout Could not open Book.dat file.;return;/ Obtain the book code of the last book in the file.finout.seekg(0);while(finout.read(char *)&book1, sizeof(book1)lastcode=book1.getcode();/* If the details of the first book are being entered, set last book code to 0.*/if(lastcode0)lastcode=0;/ Close the file.finout.close();/* Invoke the function to accept book details and pass the last book code as a parameter to it. */book2.getdata(lastcode);/ Reopen Book.dat file for adding the new record.finout.open(Book.dat, ios:app);if(!finout)cout Could not open Book.dat file.;return;/ Write the new record to the file.finout.write(char *)&book2, sizeof(book2);/ Close the file.finout.close();return;/* Function to accept and add new periodical details to the Periodical.dat file, or new issue details to the Issue.dat file. */void addper(void)char reply, check;system(cls);/ Accept whether Periodical of Issue details are being input.check=n;while(check=n)cout reply;cin.ignore();if(reply!=P & reply!=I & reply!=p & reply!=i)cout nntPlease enter P for periodical entry or I for Issue entry.;elsecheck=y;if(reply=P | reply=p)/ Declare objects of the class periodical.periodical per1, per2;int lastcode;/ Open Periodical.dat file for reading.fstream finout(Periodical.dat, ios:in);if(!finout)cout Could not open Periodical.dat file.;return;/ Obtain the periodical code of the last periodical in the file.finout.seekg(0);while(finout.read(char *)&per1, sizeof(per1)lastcode=per1.getcode();/* If the details of the first periodical are being entered, set last book code to 0.*/if(lastcode0)lastcode=0;/ Close the file.finout.close();/* Invoke the function to accept periodical details and pass the last periodical code as a parameter to it. */per2.getdata(lastcode);/ Reopen Periodical.dat file for adding the new record.finout.open(Periodical.dat, ios:app);if(!finout)cout Could not open Periodical.dat file.;return;/ Write the new record to the file.finout.write(char *)&per2, sizeof(per2);/ Close the file.finout.close();return;else/ Declare objects of the class perissue and periodical.perissue issue1, issue2;periodical per1;int issnum1, issnum2, percd1, percd2;char check=n;fstream finout1, finout2;/ Open Periodical.dat file for reading.finout1.open(Periodical.dat, ios:in);if(!finout1)cout Could not open Periodical.dat file.;return;/* Accept the periodical code for which the issue details are being entered and ensure that it exists in Periodical.dat. */while(check=n)cout percd1;finout1.seekg(0);int j=0;while(finout1.read(char *)&per1, sizeof(per1)j+; percd2=per1.getcode();if(percd1=percd2)check=y;break;if(j=0)check=y;if(check=n)cout nntINVALID PERIODICAL CODE! Please re-enter.;/ Close the Periodical.dat file.finout1.close();/ Open Issue.dat file for reading.finout2.open(Issue.dat, ios:in);if(!finout2)cout Could not open Issue.dat file.;return;/* Accept the issue number and ensure that the issue details for the specified periodical do not exist in Issue.dat. */check=n;while(check=n)cout issnum1;finout2.seekg(0);int i=0;while(finout2.read(char *)&issue1, sizeof(issue1)i+;issnum2=issue1.getissno();percd2=issue1.getpercd();if(percd1=percd2 & issnum1=issnum2)check=n;break;elsecheck=y;if(i=0)check=y;if(check=n)cout nntISSUE DETAILS ALREADY EXIST! Please re-enter.;/ Close the Issue.dat file.finout2.close();/* Invoke the function to accept issue details and pass the inputperiodical code and issue number as parameters. */issue2.getdata(percd1, issnum1);/ Reopen Issue.dat file for adding the new record.finout2.open(Issue.dat, ios:app);if(!finout2)cout Could not open Issue.dat file.;return;/ Write the new record to the Issue.dat file.finout2.write(char *)&issue2, sizeof(issue2);/ Close the file.finout2.close();return;/* Function to record details of books or periodicals issued to library members */void issueret()char issueret, bookper, check=n;system(cls);/* Ask user whether the transaction is an issue or a return transaction. */while(check=n)cout nnRECORD ISSUE/RETURN;cout issueret;if(issueret!=I & issueret!=i & issueret!=R & issueret!=r)cout nntINVALID ENTRY. Enter I for Issue or R for Return.;elsecheck=y;/* Ask user whether the transaction is for a book or a periodical. */check=n;while(check=n)cout nnRECORD ISSUE DETAILS;cout bookper;if(bookper!=B & bookper!=b & bookper!=P & bookper!=p)cout nntINVALID ENTRY. Enter B for Book issue or P for Periodical Issue.;elsecheck=y;if(bookper=B | bookper=b)/ Declare object array of the book class to read data from the file.book bookarr100;int vbookcd1, vbookcd2, i,j, mesgflag;char vstatus;/ Open Book.dat for reading.fstream finout(Book.dat, ios:in);if(!finout)cout Could not open Book.dat file for reading.;return;finout.seekg(0);/ Read the book records into the object array.for(i=0;(finout.read(char *)&bookarri, sizeof(bookarri);i+) check=n;while(check=n)/ Accept the book code.cout vbookcd1;/ Loop to process the object array.for(j=0, mesgflag=0;ji;j+) / Obtain the book code of each object.vbookcd2=bookarrj.getcode();/ Check whether it matches the input book code.if(vbookcd1=vbookcd2)/ If it matches, obtain its availability status.vstatus=bookarrj.getstatus();/ If the book is being issued, display a message if it is not available.if(issueret=I | issueret=i)if(vstatus=I)cout nntThis book has been issued. Please reenter book code.;mesgflag=1;elsebookarrj.setstatus(I);check=y;/ If the book is being returned, display a message if it is already available.elseif(vstatus=A)cout nntThis book has not been issued. Please reenter book code.;mesgflag=1;elsebookarrj.setstatus(A);check=y;break;/ If the input book code is not found, display message.if(check=n & mesgflag=0)cout nntINVALID BOOK CODE! Please re-enter.;/ Close the Book.dat file.finout.close();/ Reopen the file for overwriting existing content.finout.open(Book.dat, ios:out);if(!finout)cout Could not open Book.dat file for updating.;return;/ Write the object array back to the file.for(j=0;ji;j+)finout.write(char *)&bookarrj, sizeof(bookarrj);/ Close the file.finout.close();else/ Declare object array of the perissue class to read data from the file.perissue issuearr100;int vpercd1, vpercd2, vissnum1, vissnum2, i,j, mesgflag;char vstatus;/ Open Issue.dat for reading.fstream finout(Issue.dat, ios:in);if(!finout)cout Could not open Issue.dat file for reading.;return;finout.seekg(0);/ Read the issue records into the object array.for(i=0;(finout.read(char *)&issuearri, sizeof(issuearri);i+) check=n;while(check=n)/ Accept the periodical code and issue number.cout vpercd1;cout vissnum1;/ Loop to process the object array.for(j=0, mesgflag=0;ji;j+) / Obtain the periodical code and issue number of each object.vpercd2=issuearrj.getpercd();vissnum2=issuearrj.getissno();/ Check whether both values match the input values.if(vpercd1=vpercd2 & vissnum1=vissnum2)/ If they match, obtain the availability status.vstatus=issuearrj.getstatus();/ If the periodical is being issued, display a message if it is not available.if(issueret=I | issueret=i)if(vstatus=I)cout nntThis Periodical has been issued. Please reenter Periodical code and Issue number.;mesgflag=1;elseissuearrj.setstatus(I);check=y;/ If the periodical is being returned, display a message if it is already available.elseif(vstatus=A)cout nntThis Periodical has not been issued. Please reenter Periodical code and Issue number.;mesgflag=1;elseissuearrj.setstatus(A);check=y;break;/ If the input periodical code and issue number is not found, display message.if(check=n & mesgflag=0)cout nntINVALID PERIODICAL CODE OR ISSUE NUMBER! Please re-enter.;/ Close the Issue.dat file.finout.close();/ Reopen the file for overwriting existing content.finout.open(Issue.dat, ios:out);if(!finout)cout Could not open Issue.dat file for updating.;return;/ Write the object array back to the file.for(j=0;ji;j+)finout.write(char *)&issuearrj, sizeof(issuearrj);/ Close the file.finout.close();/* Function that deletes outdated periodical issues from the Issue.dat file. */void delissue(void)/ Declare object array of the perissue class to read data from the file.perissue issuearr100;int vpercd1, vpercd2, vissnum1, vissnum2, i,j, delctr;/ Open Issue.dat for readin