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1、把课上类的三个练习题的构造函数写出来

#include <iostream>
#include <cstring>using namespace std;class Car
{string color;string brond;double speed;
public:Car(string c,string b,double s):color("black"),brond("Benz"),speed(180.9){color = c;brond = b;speed = s;cout << "Car的有参构造" << endl;}//无参时使用默认参数Car():color("black"),brond("Benz"),speed(180.9){}void display();void acc(int a);
};void Car::display()
{cout << "汽车品牌：" << brond << endl;cout << "汽车颜色：" << color << endl;cout << "速度：" << speed << "km/h" << endl;
}void Car::acc(int a)
{speed += a;
}
int main()
{//有参构造函数Car c1("white","buick",50.5);c1.display();c1.acc(5);c1.display();Car c3;c3.display();return 0;
}

#include <iostream>using namespace std;
class Curcle
{int radius;
public:Curcle(int r):radius(5){radius = r;}Curcle():radius(5){}void show(double PI=3.14);
};void Curcle::show(double PI)
{double perimeter = 2 * PI * radius;double area = PI * radius * radius;cout << "圆的周长 = " << perimeter << endl;cout << "圆的面积 = " << area << endl;
}int main()
{Curcle s1(3);s1.show();Curcle s2;s2.show();return 0;
}

#include <iostream>using namespace std;
class Rec
{int length;int width;
public:
//    void set_length(int l);
//    void set_width(int w);Rec(int l,int w){length = l;width = w;}int get_length();int get_width();void show();
};//void Rec::set_length(int l)
//{
//    length = l;
//}//void Rec::set_width(int w)
//{
//    width = w;
//}int Rec::get_length()
{cout << "length = " << length << endl;return length;
}int Rec::get_width()
{cout << "width = " << width << endl;return width;
}void Rec::show()
{cout << "s = " << length * width << endl;
}int main()
{Rec s1(5,4);//    s1.set_length(5);
//    s1.set_width(4);int l = s1.get_length();int w = s1.get_width();s1.show();return 0;
}

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