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#include <iostream>using namespace std;
class rec
{const int length;int width;
public:rec (int length):length(length){};void set_width(int W);int get_length();int get_width();void show();
};void rec::set_width(int W)
{width=W;
}
int rec::get_length()
{return length;
}
int rec::get_width()
{return width;
}
void rec::show()
{int l,s;l=2*(length+width);s=length*width;cout<<"周长："<<l<<endl;cout<<"面积："<<s<<endl;
}
int main()
{rec s(6);s.set_width(5);int a=s.get_width();int b=s.get_length();cout<<a<<endl;cout<<b<<endl;s.show();return 0;
}

 

#include <iostream>using namespace std;
class y
{int &R;
public:y(int &R):R(R){};void show();
};void y::show()
{double PI=3.14;double l,s;l=2*PI*R;s=PI*R*R;cout<<"周长："<<l<<endl;cout<<"面积："<<s<<endl;
}
int main()
{int r=4;y s(r);s.show();return 0;
}

 

 

#include <iostream>using namespace std;
class car
{string se;string brand;int speed;
public:car(string a,string b,int c):se(a),brand(b),speed(c){};void display();void acc(int a);
};void car::display()
{cout<<se<<endl;cout<<brand<<endl;cout<<speed<<endl;
}
void car::acc(int a)
{speed=a;
}
int main()
{string a,b;getline(cin,a);getline(cin,b);car s(a,b,50);s.display();s.acc(80);return 0;
}