VolAreObject, C++ (gcc)

VolAreObject

//g++  7.4.0
//Perimeter, Area and Volume of an Object
//code is created by Rezaul Hoque on April 26, 2021
//please contact at jewelmrh@yahoo.com
#include <iostream>
#include <cmath>
using namespace std;
class object {
public:
virtual float area() { return length * breadth;}
virtual float volume() { return length *breadth *height;}
virtual float perimeter(){return 2*(length +breadth);}
protected:
float length, breadth, radius, height;
};
class circle: public object{
public: 
circle(float r=0): radius (r) {}
float perimeter() { return 2*M_PI*radius;}
float area() { return M_PI*radius*radius;}
protected:
float radius;
};
class rectangle: public object {
public:
rectangle(float l, float b): length (l), breadth (b) {}
float perimeter(){ return 2*(length +breadth);}
float area(){ return (length*breadth);}
protected:
float length, breadth;
};
class triangle : public object {
public:
triangle (float x, float y, float z) : side1(x),side2(y), side3(z) {}
float area () { float s; s= (side1+side2+side3)/2; return sqrt(s*(s-side1)*(s-side2)*(s-side3)); }
protected:
float side1, side2, side3;
};
 class cylinder: public object {
public:
cylinder(float r, float h): radius (r), height (h){}
float area(){ return 2*M_PI*radius*(height + radius);}
float volume(){ return M_PI*radius *radius * height;}
protected:
float radius, height;
};
class sphere : public object {
public:
sphere (float r): radius (r) {}
float area (){ return 4*M_PI*radius*radius;}
float volume (){return 4*1/3*M_PI*radius*radius*radius;}
protected:
float radius;
};
class cube: public object {
public:
cube(float l, float b, float h): length (l), breadth (b), height (h){}
float area(){ return 2*(length *breadth + length *height + height *length);}
float volume(){ return length * breadth * height;}
protected:
float length, breadth, height;
};
int main ()
{
circle ci(2);
rectangle rect(5,2);
triangle tri(2,3,4);
cylinder cyl(2,4);
sphere sp(2);
cube cub(4,3,2);
cout<<"Circle's perimeter is "<<ci.perimeter()<<" unit.\n";
cout<<"Circle's area is "<<ci.area()<<" square unit.\n";
cout<<"Rectangle's perimeter is "<<rect.perimeter()<<" unit.\n";
cout<<"Rectangle's area is "<<rect.area()<<" square unit.\n";
cout<<"Triangle's area is "<<tri.area()<<" square unit.\n";
cout<<"Cylinder's area is "<<cyl.area()<<" square unit.\n";
cout<<"Cylinder's volume is "<<cyl.volume()<<" cube unit.\n";
cout<<"Sphere's area is "<<sp.area()<<" square unit.\n";
cout<<"Sphere's volume is "<<sp.volume()<<" cube unit.\n";
cout<<"Cube's area is "<<cub.area()<<" square unit.\n";
cout<<"Cube's volume is "<<cub.volume()<<" cube unit.\n";
return 0;
}


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