dda

class algo {
    public:
    float x,y,x1,y1,x2,y2,dx,dy,length;
    algo(float X1,float Y1,float X2,float Y2,float Dx,float Dy,float Length) {
        x1 = X1; x2 = X2; y1 = Y1, y2 = Y2; dx = Dx; dy = Dy; length = Length;
    }
    void drawline();
};
void algo::drawline() {
    dx = (x2-x1)/length; dy = (y2-y1)/length; x = x1 + 0.5;
    y = y1 + 0.5;
    int i = 1;
    while(i++<=length) {
        putpixel(x,y,15); x += dx;
        y += dy;
    }
}