Lecture Notes 08

Object Oriented Programming: Lecture Notes 08

Author: A. El-Gadi/Faculty of Computer Engineering/Tripoli University

Below is the code for assignment 01 along with some commentary in the form of code comments. Make sure to read it through.

const double PI=3.14159;

/*The cup material and the liquid are included here as separate classes to as a design measure to make room for any future expansion of the concepts of liquid and solid material. Another design direction is to include their densities in the cup class.*/
class SolidMaterial{public: double density;
            SolidMaterial(){density=0;};
            SolidMaterial(double dens){density=dens;}};

class Liquid{public: double density;
             Liquid(){density=0;};
             Liquid(double dens){density=dens;}};

/*A cylinder object to use for cylinder proprieties; because our cup can be thought of as two coaxial cylinders.*/
class Cylinder{public: double radius; double height;
            double volume(){return PI*radius*radius*height;}
            Cylinder(){radius=0; height=0;};
            Cylinder(double r, double h){radius=r; height=h;}
        };

class Cup{private:
      /*The inner cylinder, which constitutes inner cavity of the cup*/
      Cylinder innerCylinder;
      /*The outer cylinder, determined by the inner cylinder and the cup thickness.*/
      Cylinder outerCylinder(){return Cylinder(innerCylinder.radius+thickness,innerCylinder.height+thickness);}
      double thickness;

      SolidMaterial cupMaterial;
      Liquid lq;
      double lqamount;

      public:
      /*Setting the cup attributes. The diameter is used because real life cylinders are normally given by their diameter. Using the radius instead is also fine.*/
      void setCup(double diameter, double innerht, double t, double cupmatdens){
        innerCylinder.radius=diameter/2; innerCylinder.height=innerht;
        thickness=t; cupMaterial.density=cupmatdens; lqamount=0;}
     
      /*Set liquid density. We can also use a liquid object.*/
      void setLiquid(double density){lq.density=density;}
   
      /*Fill the cup with a certain amount. If the amount exceeds the remaining capacity of the cup fill to brim.*/
      void fill(double amount){
        if(amount<=innerCylinder.volume()-lqamount){
            lqamount+=amount;
        }
        else
        {fill();}
        }

      void fill(){lqamount=innerCylinder.volume();}
      /*Empty a certain amount from the cup. If the amount to be poured exceeds the amount in the cup, empty the cup.*/
      void empty(double amount){
        if(amount<=lqamount){
            lqamount-=amount;
        }
        else
        {empty();}
        }

      void empty(){lqamount=0;}
      /*Take note of how we got the outer cylinder volume. Try to explain it to yourself.*/
      double tare(){return (outerCylinder().volume()-innerCylinder.volume())*cupMaterial.density;}

      double lqweight(){return lqamount*lq.density;}
   
      double weight(){return tare()+lqweight();}

      Cup(){setCup(0,0,0,0); lqamount=0;}
      /*Construct an empty cup*/
      Cup(double diameter, double innerht, double t, double cupmatdens, double lqdens){
        setCup(diameter,innerht,t,cupmatdens); lqamount=0; lq.density=lqdens;}
      /*Construct a cup that has a certain amount of liquid*/
      Cup(double diameter, double innerht, double t, double cupmatdens, double lqdens, double amnt){
        setCup(diameter,innerht,t,cupmatdens); fill(amnt); lq.density=lqdens;}

    };