Programming and Graphics

168 Introduction to C++ Programming and Graphics

void print() const;

void shift(double string);

private:

double x;

string color;

string setcolor(float);

};

The algebra class implementation is:

//--- CLASS IMPLEMENTATION

algebra::algebra() // default constructor

{

x=0.0;

color = "white";

}

//---

algebra::algebra(double valuex) // parametered constructor

{

x=valuex;

color = setcolor(x);

}

//---

string algebra::setcolor(float x) // set the color:

{

string color;

if(x>eps)

color="black";

else if(x<-eps)

color="red";

else

color="white";

return color;

}

//---

double algebra::get(string& color) const

{

chroma=color;

return x;

}

//---