diff --git a/d04/ex01/Cat.cpp b/d04/ex01/Cat.cpp
index 734f11a..b9a3ace 100644
--- a/d04/ex01/Cat.cpp
+++ b/d04/ex01/Cat.cpp
@@ -6,15 +6,33 @@
  * CONSTRUCTORS
  *********************************************/
 
-Cat::Cat( Brain * brain ) {
-	std::cout << COPLIEN_COLOR "Cat constructor" RESET "\n";
+/*
+ * default arguments in default constructor : https://stackoverflow.com/questions/187640/default-parameters-with-c-constructors
+ * in this cas it doesn't work i think, since both constructors don't act exactly the same
+ */
+Cat::Cat() {
+	std::cout << COPLIEN_COLOR "Cat default constructor" RESET "\n";
 	type = "cat";
-	_brain = brain;
+	_brain = new Brain();
+	return;
+}
+Cat::Cat( Brain * brain ) {
+	std::cout << COPLIEN_COLOR "Cat parameters constructor" RESET "\n";
+	type = "cat";
+	_brain = new Brain();
+	*_brain = *brain;
 	return;
 }
 
-Cat::Cat( Cat const & src ) {
+/*
+ * error: base class ‘class Animal’ should be explicitly initialized in the copy constructor [-Werror=extra]
+ * Cat::Cat( Cat const & src ) {
+ * ^~~
+ * answer : https://stackoverflow.com/questions/43612772/base-class-class-a-should-be-explicitly-initialized-in-the-copy-constructor
+ */
+Cat::Cat( Cat const & src ) : Animal(src) {
 	std::cout << COPLIEN_COLOR "Cat copy constructor" RESET "\n";
+	_brain = new Brain();
 	*this = src;
 	return;
 }
@@ -25,6 +43,7 @@ Cat::Cat( Cat const & src ) {
 
 Cat::~Cat() {
 	std::cout << COPLIEN_COLOR "Cat destructor" RESET "\n";
+	delete _brain;
 	return;
 }
 
diff --git a/d04/ex01/Cat.hpp b/d04/ex01/Cat.hpp
index 2ff1055..ba516e2 100644
--- a/d04/ex01/Cat.hpp
+++ b/d04/ex01/Cat.hpp
@@ -12,7 +12,9 @@ class Cat : public Animal {
 
 public:
 
-	Cat( Brain *brain = new Brain() );
+	Cat();
+	Cat( Brain *brain );
+//	Cat( Brain *brain = new Brain() );
 	Cat( Cat const & src );
 	~Cat();
 	Cat &	operator=( Cat const & rhs );
diff --git a/d04/ex01/Dog.cpp b/d04/ex01/Dog.cpp
index 0b9f3ba..f6f1cdb 100644
--- a/d04/ex01/Dog.cpp
+++ b/d04/ex01/Dog.cpp
@@ -6,14 +6,28 @@
  * CONSTRUCTORS
  *********************************************/
 
-Dog::Dog( Brain *brain ) {
+Dog::Dog() {
 	std::cout << COPLIEN_COLOR "Dog constructor" RESET "\n";
 	type = "dog";
-	_brain = brain;
+	_brain = new Brain();
 	return;
 }
 
+Dog::Dog( Brain *brain ) {
+	std::cout << COPLIEN_COLOR "Dog constructor" RESET "\n";
+	type = "dog";
+	_brain = new Brain();
+	*_brain = *brain;
+	return;
+}
+
+/*
+error: base class ‘class Animal’ should be explicitly initialized in the copy constructor [-Werror=extra]
 Dog::Dog( Dog const & src ) {
+^~~
+answer : https://stackoverflow.com/questions/43612772/base-class-class-a-should-be-explicitly-initialized-in-the-copy-constructor
+*/
+Dog::Dog( Dog const & src ) : Animal() {
 	std::cout << COPLIEN_COLOR "Dog copy constructor" RESET "\n";
 	*this = src;
 	return;
@@ -25,6 +39,7 @@ Dog::Dog( Dog const & src ) {
 
 Dog::~Dog() {
 	std::cout << COPLIEN_COLOR "Dog destructor" RESET "\n";
+	delete _brain;
 	return;
 }
 
@@ -34,7 +49,9 @@ Dog::~Dog() {
 
 Dog &	Dog::operator=( Dog const & rhs ) {
 	Animal::operator=(rhs);
-	_brain = rhs._brain;
+	_brain = new Brain();
+	if (this != &rhs)
+		_brain = rhs._brain;
 	return *this;
 }
 
diff --git a/d04/ex01/Dog.hpp b/d04/ex01/Dog.hpp
index 5a75ddc..17617cd 100644
--- a/d04/ex01/Dog.hpp
+++ b/d04/ex01/Dog.hpp
@@ -12,7 +12,8 @@ class Dog : public Animal {
 
 public:
 
-	Dog( Brain *brain = new Brain() );
+	Dog();
+	Dog( Brain *brain );
 	Dog( Dog const & src );
 	~Dog();
 	Dog &	operator=( Dog const & rhs );
diff --git a/d04/ex01/a.out b/d04/ex01/a.out
new file mode 100755
index 0000000..459a130
Binary files /dev/null and b/d04/ex01/a.out differ
diff --git a/d04/ex01/burn b/d04/ex01/burn
index 6199fb4..4345fd3 100755
Binary files a/d04/ex01/burn and b/d04/ex01/burn differ
diff --git a/d04/ex01/main.cpp b/d04/ex01/main.cpp
index da15404..5166e80 100644
--- a/d04/ex01/main.cpp
+++ b/d04/ex01/main.cpp
@@ -6,9 +6,10 @@
 #include <string>
 
 #include "color.h"
+#define N_TEST "7"
 
 int	main() {
-	std::cout << B_YELLOW "\n1rst test :" RESET "\n";
+	std::cout << B_YELLOW "\n[1/" N_TEST "] test subject :" RESET "\n";
 	{
 		const Animal* j = new Dog();
 		const Animal* i = new Cat();
@@ -16,7 +17,7 @@ int	main() {
 		delete i;
 	}
 
-	std::cout << B_YELLOW "\n2nd test :" RESET "\n";
+	std::cout << B_YELLOW "\n[2/" N_TEST "] test with brain :" RESET "\n";
 	{
 		Dog *	dog;
 		Cat *	cat1;
@@ -24,42 +25,46 @@ int	main() {
 		Brain *	brain1 = new Brain();
 		Brain *	brain2 = new Brain();
 
-		std::cout << B_BLUE "fill brain1 with \"giraffe\" :" RESET "\n";
+			std::cout << B_BLUE "fill brain1 with \"giraffe\" :" RESET "\n";
 		brain1->putIdeas("giraffe");
-		std::cout << B_BLUE "print brain1 :" RESET "\n";
+			std::cout << B_BLUE "print brain1 :" RESET "\n";
 		brain1->printIdeas();
-		std::cout << B_BLUE "print brain2 :" RESET "\n";
+			std::cout << B_BLUE "print brain2 :" RESET "\n";
 		brain2->printIdeas();
-		std::cout << B_BLUE "brain2 copy brain1 :" RESET "\n";
+			std::cout << B_BLUE "brain2 copy brain1 :" RESET "\n";
 		*brain2 = *brain1;
-		std::cout << B_BLUE "fill brain1 with \"hippopotamus\" :" RESET "\n";
+			std::cout << B_BLUE "fill brain1 with \"hippopotamus\" :" RESET "\n";
 		brain1->putIdeas("hippopotamus");
-		std::cout << B_BLUE "print brain1 :" RESET "\n";
+			std::cout << B_BLUE "print brain1 :" RESET "\n";
 		brain1->printIdeas();
-		std::cout << B_BLUE "print brain2 :" RESET "\n";
+			std::cout << B_BLUE "print brain2 :" RESET "\n";
 		brain2->printIdeas();
 
-		std::cout << B_BLUE "create new dog with brain1 :" RESET "\n";
+			std::cout << B_BLUE "create new dog with brain1 :" RESET "\n";
 		dog = new Dog(brain1);
-		std::cout << B_BLUE "create new cat with brain1 :" RESET "\n";
+			std::cout << B_BLUE "create new cat with brain1 :" RESET "\n";
 		cat1 = new Cat(brain1);
-		std::cout << B_BLUE "cat2 copy cat1 :" RESET "\n";
+			std::cout << B_BLUE "cat2 copy cat1 :" RESET "\n";
 		cat2 = *cat1;
 
-		std::cout << B_BLUE "fill brain1 with \"zebra\" :" RESET "\n";
+			std::cout << B_BLUE "fill brain1 with \"zebra\" :" RESET "\n";
 		brain1->putIdeas("zebra");
-		std::cout << B_BLUE "print cat1 :" RESET "\n";
+			std::cout << B_BLUE "print cat1 :" RESET "\n";
 		cat1->printBrain();
-		std::cout << B_BLUE "print cat2 :" RESET "\n";
+			std::cout << B_BLUE "print cat2 :" RESET "\n";
 		cat2.printBrain();
 
+			std::cout << B_BLUE "delete dog :" RESET "\n";
 		delete dog;
+			std::cout << B_BLUE "delete cat1 :" RESET "\n";
 		delete cat1;
+			std::cout << B_BLUE "delete brain1 :" RESET "\n";
 		delete brain1;
+			std::cout << B_BLUE "delete brain2 :" RESET "\n";
 		delete brain2;
 	}
 
-	std::cout << B_YELLOW "\narray animal test :" RESET "\n";
+	std::cout << B_YELLOW "\n[3/" N_TEST "] array animal test :" RESET "\n";
 	{
 		Animal	*animals[10];
 		int		i;
@@ -74,7 +79,7 @@ int	main() {
 			delete animals[i];
 	}
 
-	std::cout << B_YELLOW "\ncopy constructor test1 :" RESET "\n";
+	std::cout << B_YELLOW "\n[4/" N_TEST "] copy constructor test1/2 :" RESET "\n";
 	{
 		std::cout << B_BLUE "Cat a_cat :" RESET "\n";
 		Cat	a_cat;
@@ -82,7 +87,7 @@ int	main() {
 		Cat	a_cpy_cat(a_cat);
 	}
 
-	std::cout << B_YELLOW "\ncopy constructor test2 :" RESET "\n";
+	std::cout << B_YELLOW "\n[5/" N_TEST "] copy constructor test2/2 :" RESET "\n";
 	{
 		std::cout << B_BLUE "Cat a_cat :" RESET "\n";
 		Cat	a_cat;
@@ -90,7 +95,7 @@ int	main() {
 		Cat	a_cpy_cat = a_cat;
 	}
 
-	std::cout << B_YELLOW "\nassignation operator test1 :" RESET "\n";
+	std::cout << B_YELLOW "\n[6/" N_TEST "] assignation operator test1 :" RESET "\n";
 	{
 		std::cout << B_BLUE "Cat a_cat :" RESET "\n";
 		Cat	a_cat;
@@ -100,7 +105,7 @@ int	main() {
 		a_cpy_cat = a_cat;
 	}
 
-	std::cout << B_YELLOW "\nassignation operator test2 :" RESET "\n";
+	std::cout << B_YELLOW "\n[7/" N_TEST "] assignation operator test2 :" RESET "\n";
 	{
 		std::cout << B_BLUE "const Cat *a_cat :" RESET "\n";
 		const Cat *a_cat = new Cat();
diff --git a/d04/ex01/test.cpp b/d04/ex01/test.cpp
new file mode 100644
index 0000000..c7f9492
--- /dev/null
+++ b/d04/ex01/test.cpp
@@ -0,0 +1,43 @@
+#include <iostream>
+class A {
+public:
+	A &	operator=( A const & rhs ) {
+		std::cout << "A assignation operator\n";
+		_i = rhs._i;
+		return *this;}
+private:
+	int	_i;
+};
+
+class B {
+public:
+	B() {
+		std::cout << "B default constructor\n";
+		_a = new A();}
+	B( A *a ) {
+		std::cout << "B parameterized constructor\n";
+		_a = new A();
+		*_a = *a;}
+
+	~B() {
+		std::cout << "B destructor\n";
+		delete _a;}
+private:
+	A	*_a;
+};
+
+int	main() {
+	{
+		const B * b = new B();
+		delete b;
+	}
+	std::cout << "\n";
+	{
+		B * b;
+		A * a = new A();
+		b = new B(a);
+		delete a;
+		delete b;
+	}
+	return 0;
+}