co3moz

var check = function(o) {
  return (o == null) ? null : o.constructor == Function ? o.name == "" ? "Callback" : "Class_" + o.name : o.constructor.name;
};

// how can be different check and typeof
// checkfor           check result    typeof result
check(null);          //null          "object"
check(undefined);     //null          "undefined"
check(1);             //"Number"      "number"
check([]);            //"Array"       "object"

co3moz

#include <iostream>
#include <math.h>

using namespace std;

class Matris {
private:
  double* objects;
  int k;
  int iterator = 0;