#include
usingnamespacestd;
classAnimal
{
public:
voidspeak(){cout<<"animallanguage!"<
classCat:publicAnimal
{
public:
voidspeak(){cout<<"catlanguage:miaomiao!"<
intmain()
{
Catcat;
cat.speak();
}
catlanguage:miaomiao!
举一反三
- 给出下面程序的运行结果 #include usingnamespacestd; intmain { cout<<"This"<<""<<"is"<<""; cout<<"a"<<""<<"C++"<<""; cout<<"program."<<endl; return0; }
- #分析下面程序运行的结果。 #include usingnamespacestd; intmain { cout<<"This"<<"is"; cout<<"a"<<"C++"; cout<<"program."<<endl; return0; }#
- 下列程序的运行结果是:#include<iostream>usingnamespacestd;intmain(){inta=2;intb=a+1;cout<<a/b<<endl;return0;}
- 写出程序运行结果:_________ #include <iostream.h> class Bas { public: ~Bas() { cout<<"Bas construct"<<endl; } virtual void f()=0; }; class Dev:public Bas { public: ~Dev() { cout<<"Bas construct"<<endl; } virtual void f() { cout<<"Dev::f"<<endl; } }; void main() { Bas *a; Dev p; a=&p; a->f(); }
- 阅读下列程序,写出运行结果。 #include [iostream] using namespace std; int main() { int a = 1, b = 2; bool x, y; cout [< (a++)+(++b) << endl; cout << a % b << endl; x = !a]b; y = a-- && b; cout << x << endl; cout << y << endl; }
内容
- 0
下列程序的执行结果是___________。 #include[iostream.h] class A { public: A() { cout[<endl<<"实例化类A的一个对象。"; } virtual ~A() { cout<<endl<<"消除类A的一个对象。"; } virtual void f() { cout<<endl<<"执行类A的成员函数。"; } }; class B:public A { public: B() { cout<<endl<<"事例化类B的一个对象。"; } virtual ~B() { cout<<endl<<"消除类B的一个对象。"; } void f() { cout<<endl<<"执行类B的成员函数。"; } }; void main() { A a=A(); B b=B(); cout<<endl<<"----------"; a.f(); b.f(); cout<<endl<<"----------"; A *p; p=&b; p-]f(); cout<<endl<<"----------"; }
- 1
运行下列程序,第1行输出是____,第2行输出是____,第3行输出是____,第4行输出是____。 #include[iostream] using namespace std; class A{ int a; public: A( ){ a=1; cout<<a<<endl; } ~A(){ a--; cout<<a<<endl; } }; class B{ int b; A a1; public: B( ){ b=3; cout<<b<<endl; } ~B(){ b--; cout<<b<<endl; } }; int main( ) { B b; return 0; }
- 2
运行下列程序,第1行输出是____,第2行输出是____,第3行输出是____。 #include[iostream] using namespace std; class A{ int a; public: A( ){ a=0; cout<<a<<endl; } A(int t){ a=t; cout<<a<<endl; } A(A &t){ a=t.a+10; cout<<a<<endl; } }; int main(void) { A a1,a2=1,a3=a2; return 0; }
- 3
下列程序的运行结果是( )。 #include<iostream.h> classA int a; public: A: A()a=0;A()int aa B: a=aa; C: cout<<a++;; D: void main() E: A x,y(2),z(3); F: cout<<endl; G: 00 H: 23 I: 34 D.25
- 4
【填空题】下列程序的输出结果是________。#include<iostream>usingnamespacestd;intf(inta,intb){staticintx=3;if(b>2){x=x*x;b=x;}elseb=x+1;returna+b;}intmain(){inta=3,b;b=2;cout<<f(a,b)<<endl;b=3;cout<<f(a,b);return0;}