題目描述我的代碼在運行一部分后會意外終止，我知道是內存出現了問題，但到底是哪句話出了錯？這是我們學校的一道練習實驗題相關代碼#ifndefADDRESS_BOOK_H#defineADDRESS_BOOK_H#includeusingstd::cin;usingstd::cout;usingstd::endl;usingstd::string;structaddress{stringname;longlongphone_number;longlongclassroom;longlongdormitory;};classbook{protected:address*a=NULL;intlistsize;intarraylength;public:book();book(constbook&a);//復制構造函數；~book();voidinsert(book&a);void_delete(book&a,stringc);voidcompile(book&a,stringc);boolfind(constbook&a,stringc);voidprint(constbook&a,intn);};#endifbook::book(){listsize=0;arraylength=50;a=newaddress[arraylength];for(inti=0;i>b.a[listsize].phone_number>>b.a[listsize].classroom>>b.a[listsize].dormitory;listsize++;}voidbook::_delete(book&b,stringc){for(inti=0;i>n1;b.a[i].phone_number=n1;}elseif(n==2){intn2;cin>>n2;b.a[i].classroom=n2;}elseif(n==3){intn3;cin>>n3;b.a[i].dormitory=n3;}}}}boolbook::find(constbook&b,stringc){inti;for(i=0;ic;b.compile(b,c);}elseif(nn2==3){cout