c++程序输出求解答

1. 请写出下列程序的输出结果。
#include <iostream.h>
class Test{
public:
Test(int x=0):val(x) { cout<<"Cons "<<val<<endl; }
Test(const Test &p) { val=p.val; cout<<"Copy "<<val<<endl; }
friend Test operator + (Test &t1,Test &t2);
private:
int val;
};
Test operator + (Test &t1,Test &t2) {
Test temp(t1.val+t2.val);
return temp;
}
int main() {
Test A(1),B(3);
Test C;
C=A+B;
return 0;
（8 分）
7

}
2. 请写出下列程序的输出结果。
#include <iostream.h>
class Base {
public:
void f() { cout<<"fB"<<endl; }
virtual void g() { cout<<"gB"<<endl; }
};
class Derived : public Base {
public:
void f() { cout<<"fD"<<endl; }
virtual void g() { cout<<"gD"<<endl; }
};
int main() {
Base *p=new Derived;
p->f();
p->g();
return 0;
}
（6 分）
8

3. 请写出下列程序的输出结果。
#include <iostream.h>
class Base{
public:
Base() { cout<<"Base"<<endl; }
~Base() { cout<<"~Base"<<endl; }
};
class Base1 : virtual public Base{
public:
Base1() { cout<<"Base1"<<endl; }
~Base1() { cout<<"~Base1"<<endl; }
};
class Base2 : virtual public Base{
public:
Base2() { cout<<"Base2"<<endl; }
~Base2() { cout<<"~Base2"<<endl; }
};
class Derived : public Base1, public Base2 {
public:
（10 分）
9

Derived() { cout<<"Derived "<<endl; }
~Derived() { cout<<"~Derived"<<endl; }
private:
Base b;
};
int main() {
Derived d;
return 0;
}
4. 请写出下列程序的输出结果 。
#include <iostream.h>
class A {
public:
A(int i):r1(i){ cout<<r1<<endl; }
~A(){ cout<<'~'<<r1<<endl; }
void print(){cout<<"Empty:"<<r1<<endl;}
void print() const {cout<<"Const:"<<r1<<endl;}
void print(int x){cout<<"Param:"<<x*x<<endl;}
private:
int r1;
};
int main() {
A a1(1),a2(2);
a1.print();
（8 分）
10

a2.print(3);
return 0;
}
11

我帮你运行一下吧：
1.
Cons 1
Cons 3
Cons 0
Cons 4
Copy 4

2.
fB
gD

3.
Base
Base1
Base2
Base
Derived
~Derived
~Base
~Base2
~Base1
~Base

4.
1
2
Empty:1
Param:9
~2
~1

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