C++程序题.doc

1.有两个长方柱，其长.宽.高分别是（1）12，20，25；（2）10，14，20；求它们的体积，编写一个基于对象的程序，在类中用带参数的构造函数对数据成员初始化。
#include <iostream>
using namespace std;
class Box
{public:
   Box(int,int,int);
   int volume();
private:
   int height;
   int width;
   int length;
};
Box::Box(int h,int w,int len)
{height=h;
width=w;
length=len;
}
int Box::volume()
{return(height*width*length);
}

int main()
{
Box box1(12,25,30);
cout<<"The volume of box1 is "<<box1.volume()<<endl;
Box box2(15,30,21);
cout<<"The volume of box2 is "<<box2.volume()<<endl;
return 0;
}

2.声明一个基类学生，在声明基类的公用派生类研究生，用指向基类对象的指针输出数据。
#include <iostream>
#include <string>
using namespace std;
class Student
{public:
Student(int ,string ,float);
void display();
private:
int num;
string name;
float score;
};
Student::Student(int n,string nam ,float s)
{num=n;
name=nam;
score=s;
}
void Student::display()
{cout<<endl<<"num:"<<num<<endl;
cout<<endl<<"name:"<<name<<endl;
cout<<endl<<"score:"<<score<<endl;
}
class Graduate: public Student
{public:
Graduate(int ,string ,float,float );
void display();
private:

float wage;
};
Graduate::Graduate(int n,string nam,float s,float w):Student(n,nam,s),wage(w){}
Void Graduate::display()
{ Student::display()
Cout<<”wage=”<<wage<<endl;
}
int main()
{Student stud1(1001,"gg",88.9);
Graduate gra1(2001,"ff",66.9,19999);
Student* pt=&stud1;
pt->display();
pt=&gra1;
pt->display();

}

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