Can't think of a Subject

[Bjwbell]

I have a particleEgine class. the problem is i can't figure out how too have the user define the number of particles.
Here'se the relevant code

class ParticleEngine{
      public:
       ParticleEngine(int NumParticles,float posx1,float posy1,float posz1 ,float xspeed1,float yspeed1,float zspeed1, bool cont,bool samecolor1 ,float red1,float green1,float blue1);
       ~ParticleEngine();
       bool Keyboard();
       bool Render();
       bool PassObject(Object Obj);
       protected:

              static int const MAX_PARTICLES;
               particles particle[MAX_PARTICLES]; 

Now the problem is i use the particle array in my Render function and other functions
but i don't know how too make soo i can define the max number of particles in the constuctor;