1、矩形类

#include <iostream>using namespace std;class Rec         //类默认私有属性
{int length;int width;
public:              //设置共有属性void set_length(int l);void set_width(int w);void show();int get_length();int get_width();
};void Rec::set_length(int l)
{length = l;
}
void Rec::set_width(int w)
{width = w;
}
void Rec::show()
{cout<<"周长="<<(length+width)*2<<endl;cout<<"面积="<<(length*width)<<endl;
}
int Rec::get_length()
{return length;
}
int Rec::get_width()
{return width;
}int main()
{Rec a;a.set_length(3);a.set_width(2);int len = a.get_length();int wid = a.get_width();cout<<"长="<<len<<endl;cout<<"宽="<<wid<<endl;a.show();return 0;
}

2、圆类

#include <iostream>using namespace std;class Cir
{int r;public:void set_r(int a);void show();
};void Cir::set_r(int a)
{r = a;
}
void Cir::show()
{cout<<"圆的周长为："<<(2*3.14*r)<<endl;cout<<"圆的面积为："<<(3.14*r*r)<<endl;
}int main()
{Cir c;c.set_r(4);c.show();return 0;
}

3、Car类

#include <iostream>using namespace std;class Car
{string brand;string color;int speed;
public:void display();void accelerate(int amount);void set(string b,string c,int s);
};void Car::display()
{cout<<"品牌："<<brand<<endl;cout<<"颜色："<<color<<endl;cout<<"速度："<<speed<<endl;
}void Car::set(string b, string c, int s)
{brand = b;color = c;speed = s;
}
void Car::accelerate(int amount)
{cout<<"加速前："<<speed<<endl;speed += amount;cout<<"加速后："<<speed<<endl;
}int main()
{Car c;c.set("五菱宏光","经典银",200);c.display();c.accelerate(50);return 0;
}

思维导图