C++上機期末考題答案

C++上機期末考題答案C++上機期末考題答案C++上機期末考題答案V:1.0精細整理，僅供參考C++上機期末考題答案日期：20xx年X月一改錯閱讀下列程序，改正程序中的錯誤。（1）classA{private:intx,y；public：voidfun(inti,intj=0){x=i;y=j；}voidshow(){cout<<x<<“”<<y<<endl;}};voidmain(){Aa1;a1.fun(2);a1.show();}（2）#include<iostream>classDate;classTime{public:Time(inth,intm,ints){hour=h,minute=m,sec=s；}voidshow(Date&d)；private:inthour,minute,sec;};classDate{public:Date(intm,intd,inty){month=m,day=d,year=y;}friendvoidTime::show(Date&)；private:intmonth,day,year;};voidTime::show(Date&d){cout<<d.month<<"-"<<d.day<<"-"<<d.year<<endl;cout<<hour<<":"<<minute<<":"<<sec<<endl;}voidmain(){Timet1(9,23,50);Dated1(12,20,2008);t1.show(d1);}(3)#include<iostream.h>classTest{private:intx,y=20;staticintm;public:Test(inti,intj){x=i,y=j;}intgetx(){returnx;}intgety(){returny;}staticintf(){returnm;}};intTest::m=0;voidmain(){Testmt(10,20);cout<<mt.x<<endl;cout<<mt.y<<endl;}二．填空題1．一個類的頭文件如下所示，num初始化值為5，程序產(chǎn)生對象T，且修改num為10，并使用show()函數(shù)輸出num的值10。#include<iostream.h>classTest{private:staticintnum;public:Test(int);voidshow();};_________Test::Test(intn){num=n;}voidTest::show(){cout<<num<<endl;}voidmain(){Testt(10);_________}答案：intTest::num=5;，t.show();（2）在下劃線處填上缺少的部分。#include<iostream.h>classA{inta,b;public:_____；//定義構造函數(shù)，使參數(shù)i和j的默認值為0{a=i;b=j;}//在函數(shù)體中用i初始化a，用j初始化b};main(){A*p;_____;//調(diào)用帶參構造函數(shù)生成由p指向的動態(tài)對象//使a和b成員分別被初始化為4和5}答案：A(inti=0,intj=0)，p=newA(4,5)解析］構造函數(shù)帶默認參數(shù)為0，使用new運算符動態(tài)分配對象空間，同時初始對象成員值4，5。三讀程序結果1.給出下面程序輸出結果。#include<iostream.h>classexample{inta;public:example(intb=5){a=b++;}voidprint(){a=a+1;cout<<a<<"";}voidprint()const{cout<<a<<endl;}};voidmain(){examplex;constexampley(2);x.print();y.print();}答案：62［解析］x是普通對象，調(diào)用普通的print函數(shù)；而y常對象，調(diào)用常成員函數(shù)。（2）#include<iostream.h>classMy{public:My(){cout<<'A';}My(charc){cout<<c;}~My(){cout<<'B';}};intmain(){Myp1,*p2;p2=newMyclass[2];deletep2;return0;}答案AAAXXB（3）classA{floatx;public:A(inta){x=a;cout<<"調(diào)用了A的構造函數(shù)\n";}~A(){cout<<"調(diào)用了A的析構函數(shù)\n";}};classB{floaty;public:B(inta){y=a;cout<<"調(diào)用了B的構造函數(shù)\n";}~B(){cout<<"調(diào)用了B的析構函數(shù)\n";}};classC{floatz;Bb1;Aa1;public:C(inta,intb,intc):a1(a),b1(b){z=c;cout<<"調(diào)用了C的構造函數(shù)\n";}~C()