課件cbdcsd1202期中測評

在32位操作系統(tǒng)下，請寫出下列類型各占多少字節(jié)？sizeof(int)=(4); sizeof(double)=(8);sizeof(longint)=(4);sizeof(float)=(4);sizeof(char)=(1);sizeof(longlongint)=(8);intb[4]={0,1,2,3};sizeof(b)=(4);int*p=0;sizeof(p)=(4 strlen(c)=(7inta;ifaBOOL if(!a)orfloat:constEXPRESSIONEXP=0.000001if(a<EXP&&a>-EXP)pointer:if(a!=NULL)orif(a==#defineDOUBLE(x)x+x，i5*DOUBLE(5)iInt printf("c=%d\n",c);C=(12數(shù)據(jù)庫表是有一條一條 new、deletemalloc、freefreeC++/C語言的標(biāo)準(zhǔn)庫函數(shù)，new/deleteC++的運(yùn)算符。它們都可用于申請動(dòng)態(tài)內(nèi)對象在創(chuàng)建的同時(shí)要自動(dòng)執(zhí)行構(gòu)造函數(shù)，對象在消亡之前要自動(dòng)執(zhí)行析構(gòu)函數(shù)。由于Malloc/freeCmalloc/free是庫函數(shù)而不是運(yùn)算符，不在編譯器控制權(quán)限之內(nèi)，不能夠把執(zhí)行構(gòu)造函數(shù)和析構(gòu)函數(shù)的任務(wù)強(qiáng)加于malloc/free。deletedelete[]deletedelete[]會(huì)調(diào)用每一個(gè)成員的析構(gòu)函數(shù),deleteoperatordelete來釋放 const意味著“只讀，constinta; //常整形數(shù)intconst //常整形constint*a; int*consta; intconst*aconst; 一個(gè)指向常整型數(shù)的常指針（也就是說，指針指向的整型數(shù)是不可封裝：將客觀事物抽象成類，每個(gè)類對自身的數(shù)據(jù)和方法實(shí)行protection(private, Oracle內(nèi)連接：Selectfirst_name,salary,gradefroms_emp,salgradewhere betweenlosal(+)and first_name,salary,gradefroms_empleftouterjoinsalgradeonsalarybetweenlosalandhisal;Createtables_csd(namevarchar2(15),IDnumber);insertintotest123values('Tarena',1);deletes_csdwhere三編程題（請?jiān)诩埖谋趁婢帉?并標(biāo)明題號strcpychar*strcpy(char*strDest,constchar*strSrc //{assert((strDest!=NULL)&&(strSrc!=NULL));char*address=strDest;while((*strDest++=*strSrc++)!=‘\0’return}class{String(constchar*strNULL);//String(constString&another);//~String();//String&operaterconstString&rhs);//char*m_data;//{{m_data=newchar[1];m_data[0]='\0';}{m_data=newchar[strlen(str)+1];}}{m_data=newchar[strlen(another.m_data)+1];}String&String::operator=(constString{if(this==return*thism_data=newchar[strlen(rhs.m_data)+1];return*this}{delete[]m_data}//int{intsdsocket(PF_INET,SOCK_STREAM,0);if(sd==-1)perror("socket創(chuàng)建失敗"),exit(-1);structsockaddr_inaddr;memset(&addr,0,sizeof(addr));addr.sin_family=PF_INET;addr.sin_port=htons(8888);intr=bind(sd,(conststructsockaddr*)&addr,sizeof(addr));r=listen(sd,structsockaddr_infromaddr;intlen=sizeof(fromaddr);intasd=accept(sd,(structsockaddr*)&fromaddr,&len);char*msg=inet_ntoa(fromaddr.sin_addr);charbuf[100]={};}}

recv(asd,buf,sizeof(buf),printf從客戶端%s接收到的數(shù)據(jù):%s\n",inet_ntoa(fromaddr.sin_addr),send(asd,"干的不錯(cuò)，OK\n",strlen("干的不錯(cuò)，OK\n"),0);//int{intsdsocket(PF_INET,SOCK_STREAM,0);if(sd==-1)perror("socket創(chuàng)建失敗"),exit(-1);structsockaddr_inaddr;memset(&addr,0,sizeof(addr));addr.sin_family=PF_INET;addr.sin_port=htons(8888);intr=connect(sd,(conststructsockaddr*)&addr