#include<iostream>

using namespace std;

class rect{

  public:

      rect(float L=1.0,float W=1.0){

          length=L;

          wide=W;

     }

     area(){

         cout<<length*wide;

     }

 private:

     float length,wide;

 };

 int main(){

     float length,wide;

     cin>>length>>wide;

     rect x(length,wide);

     x.area();

     return 0;

 }

 

#include<iostream>

using namespace std;

class Complex {

      public:

          Complex( double at, double bt) {

              a=at;

              b=bt;

         }

          Complex( double at) {

             a=at;

         }

          Complex(){ a=1; b=1;

    }

         void add(Complex &num) {

             a=a+num.a;

             b=b+num.b;

         }

         void show(){          

   cout<<a<<"+"<<b<<"i"<<endl;

         }

     private:

         double a,b;

        };

 int main(){   

     Complex c1(3,5);

     Complex c2(4.5);

     Complex c3;

     c1.add(c2);

     c1.show();

     c3.show();

     return 0;

   }

实验总结：类与对象是面向对象程序设计最重要的东西，首次接触，不仅需熟知概念性知识，更应多多编写比较，充分理解其宗旨。本次实验涉及到了类，对象。成员，编写时不够熟练顺利。