课程《面向对象程序设计》_题库列表第17页_查题网

面向对象程序设计

截止12-31，该科目累计收录道题目。

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下面程序的执行结果是什么？#include<iostream>using namespace std;class goods{private: static int totalweight; int weight;public: goods(int w){ weight=w; totalweight+=weight; } goods(goods& gd){ weight=gd.weight; totalweight+=weight; } ~goods(){ totalweight-=weight; } static int gettotal(){ return totalweight; }};int goods::totalweight=0;int main(){ goods g1(50); cout<<goods::gettotal()<<endl; goods g2(100); cout<<g2.gettotal()<<endl;return 0;}
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- 2023-10-28 18:37:33
写出下面程序的执行结果：#include<iostream>using namespace std;class A{ int a,b; public : A(int i,int j){a=i;b=j;} void move(int x,int y){a+=x;b+=y;} void show( ){cout<<a<<","<<b<<endl;} };class B:public A{ int x,y;public : B(int i,int j,int k,int l):A(i,j),x(k),y(l){} void show( ){cout<<x<<","<<y<<endl;} void fun( ){ move(3,5);} void f1( ){ A::show( ); }};int main( ){A e(1,2); e.show( ); B d(3,4,5,6); d.fun( ); d.A::show( ); d.B::show( ); d.f1( ); return 0;}
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- 2023-10-28 18:37:33
写出下列程序的输出结果。#include<iostream>using namespace std;class AA{public : AA(){cout<<"ConstructorofAA.\n";fun( );} virtual void fun( ){cout<<"AA::fun( )is called.\n";}};class BB:public AA{public :BB( ){cout<<"Constructor of BB.\n"; fun( );}void fun( ){cout<<"BB::fun( )is called.\n";}};int main( ){BB d; return 0;}
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- 2023-10-28 18:37:33
写出下列程序的运行结果。#include<iostream>using namespace std;class AA{public : static int n; AA( ){n++;}};int AA::n=0;int main( ){ cout<<AA::n<<endl; AA d1; cout<<d1.n<<endl; AA d2; cout<<d2.n<<endl; AA d3,d4; cout<<d1.n<<endl; cout<<d2.n<<endl; return 0;}
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- 2023-10-28 18:37:33
下面程序的执行结果是什么？#include<iostream>using namespace std;class A{public: virtual void pr(){cout<<"1"<<' ';}};class B:public A{ void pr(){cout<<"2"<<' ';}};void p1(A& a){a.pr();}void p2(A a){a.pr();}int main(){ B b; p1(b); p2(b); return 0;}
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- 2023-10-28 18:37:33
给出下面程序输出结果。#include <iostream> using namespace std; class Base {private: int Y; public: Base(int y=0) {Y=y;cout<<y-1<<' ';}~Base() {cout<<0<<' ';}void print() {cout <<Y<<' ';} }; class Derived:public Base {private: int Z; public: Derived (int y, int z):Base(y) { Z=z; cout<<y-2<<' '<<z+3<<' '; } ~Derived() {cout<<1<<' ';} void print() {Base::print(); cout<<Z<<' '; } };int main() { Derived d(50,60); d.print(); return 0;}
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- 2023-10-28 18:37:33
写出下面程序的执行结果：#include<iostream>using namespace std;class A{private: int a,b;public : A( ); A(int i,int j); void print ( );};A::A( ){ a=b=0; cout<<"Default constructor is called. "; }A::A(int i,int j){ a=i; b=j; cout<<"Constructor is called. "; }void A::print ( ){ cout<<"a="<<a<<","<<"b="<<b<<endl; }int main( ){ A m,n(4,8); m.print ( ); n.print ( ); return 0;}
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- 2023-10-28 18:37:33
写出下面程序的执行结果：#include<iostream>using namespace std;class A{public : A( ){} virtual void f( ){cout<<"A::f( )iscalleD. ";}};class B:public A{ public : B( ){f( );} void g( ){f( );}};class C:public B{ public : C( ){} virtual void f( ){cout<<"C::f( )is called. ";}};int main( ){C c; c.g( );return 0;}
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- 2023-10-28 18:37:33
写出下面程序的执行结果：#include<iostream>using namespace std;class AA{int a;public :AA(int i){a=i;cout<<"AA="<<a<<" ";}virtual ~AA( ){cout<<"~AA="<<a<<" ";}};class BB:public AA{int b;public :BB(int i,int j):AA(i){b=j;cout<<"BB="<<b<<" ";}~BB( ){cout<<"~BB="<<b<<" ";}};int main( ){AA *pa=new AA(8); delete pa;AA*pb=new BB(6,9); delete pb; return 0;}
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- 2023-10-28 18:37:33
写出下面程序的执行结果：#include<iostream>using namespace std;class B{protected: int b;public : B(int i){b=i+50;show( );} B( ){} virtual void show( ){cout<<"B::show( ) is called. b="<<b<<endl;}};class D:public B{ protected: int d;public : D(int i):B(i){d=i+100;show( );} D( ){} void show( ){cout<<"D::show( )is called. d="<<d<<endl;}};int main( ){D d1(108); return 0;}
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- 2023-10-28 18:37:33