Cpp Class Template

A little simple example to illustrate classes in C++. See also Cpp Classless Template.

#include <stdio.h>
#include <math.h>

class geo_obj
{
protected:
    int m_x;
    int m_y;

public:
    geo_obj(int x, int y)
    {
        this->m_x = x;
        this->m_y = y;
    }

    int X()
    {
        return this->m_x;
    }

    int Y()
    {
        return this->m_y;
    }

    void print()
    {
        printf("%d, %d", this->m_x, this->m_y);
    }
};


class circle : public geo_obj
{
private:
    int m_r;

public:
    circle(int x, int y, int r) : geo_obj(x, y)
    {
        this->m_r = r;
    }

    bool is_inside(geo_obj g)
    {
        return pow(g.X() - this->m_x,2) + pow(g.Y() - this->m_y,2) <= pow(this->m_r, 2);
    }

    void circle::print()
    {
        geo_obj::print();
        printf(", r=%d", this->m_r);
    }
};


int main(int argc, char * argv[])
{
    geo_obj point = geo_obj(2, 3);
    circle c = circle(1, -3, 8);

    printf("point at ");
    point.print();
    printf(" is inside of circle ");
    c.print();
    printf("? ");
    printf(c.is_inside(point) ? "yes" : "no");
    printf("\n");

    return 0;
}

Download source code here: [1]

The output is of course point at 2, 3 is inside of circle 1, -3, r=8? yes

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