diff --git a/README.md b/README.md
index daa39f6..fc12e72 100644
--- a/README.md
+++ b/README.md
@@ -10,4 +10,8 @@ Lab de prog. en C++.
 
 [ex4] Fichiers
 
-[tp1] Mot mystere
\ No newline at end of file
+[tp1] Mot mystere
+
+[ex5] Surcharge d'operateurs (Duree)
+
+[tp2] Surcharge d'operateurs (Fraction)
diff --git a/ex5.cpp b/ex5.cpp
new file mode 100644
index 0000000..24857d1
--- /dev/null
+++ b/ex5.cpp
@@ -0,0 +1,20 @@
+#include <iostream>
+#include <string>
+
+#include "ex5/Duree.h"
+
+using namespace std;
+
+
+
+int main(){
+	Duree d1(0, 10, 30);
+	Duree d2(2, 14, 89);
+
+	cout << d1 << " +  " << d2 << " -> " << d1+d2 << endl;
+	cout << d1 << " == " << d2 << " -> " << (d1==d2) << endl;
+	cout << 2  << " *  " << d2 << " -> " << (2*d2) << endl;
+
+
+	return 0;
+}
\ No newline at end of file
diff --git a/ex5/Duree.cpp b/ex5/Duree.cpp
new file mode 100644
index 0000000..2bdaa2a
--- /dev/null
+++ b/ex5/Duree.cpp
@@ -0,0 +1,85 @@
+/* [x] Constructeur
+=========================================================*/
+void Duree::fix(){
+	int stack(0);
+
+	// Gestion du debordement de secondes
+	stack = _s;
+	if( stack >= 60 ){
+		_s  = stack % 60;
+		_m += stack / 60;
+	}
+	
+	// Gestion du debordement de minutes
+	stack = _m;
+	if( stack >= 60 ){
+		_m  = stack % 60;
+		_h += stack / 60;
+	}
+}
+
+Duree::Duree(int h, int m, int s) : _h(h), _m(m), _s(s){
+	this->fix();
+}
+
+Duree::Duree(const Duree& d) : _h(d._h), _m(d._m), _s(d._s){
+	this->fix();
+}
+
+/* [0] Affichage
+=========================================================*/
+ostream& operator<<(ostream& o, const Duree& d){
+	o << "[" << d._h << ":" << d._m << "," << d._s << "]";
+
+	return o;
+}
+
+
+
+/* [1] Egalite
+=========================================================*/
+bool Duree::operator==(const Duree& x){
+	return _h == x._h && _m == x._m && _s == x._s;
+}
+
+
+
+/* [2] Addition
+=========================================================*/
+void Duree::operator+=(const Duree& d){
+	_h += d._h;
+	_m += d._m;
+	_s += d._s;
+
+	this->fix();
+}
+
+Duree operator+(Duree& l, Duree& r){
+	Duree tmp(l);
+	tmp += r;
+	return tmp;
+}
+
+
+
+/* [3] Multiplication
+=========================================================*/
+void Duree::operator*=(const int d){
+	_h *= d;
+	_m *= d;
+	_s *= d;
+
+	this->fix();
+}
+
+Duree operator*(int l, Duree& r){
+	Duree tmp(r);
+	tmp *= l;
+	return tmp;
+}
+
+Duree operator*(Duree& l, int r){
+	Duree tmp(l);
+	tmp *= r;
+	return tmp;
+}
\ No newline at end of file
diff --git a/ex5/Duree.h b/ex5/Duree.h
new file mode 100644
index 0000000..521f1fa
--- /dev/null
+++ b/ex5/Duree.h
@@ -0,0 +1,36 @@
+#ifndef DEF_DUREE
+	
+	#define DEF_DUREE
+	#include <iostream>
+	#include <string>
+	using namespace std;
+
+	class Duree{
+		public:
+			Duree(int h=0, int m=0, int s=0);
+			Duree(const Duree& d);
+
+			bool operator==(const Duree& x);
+			void operator+=(const Duree& d);
+			void operator*=(const int d);
+
+		private:
+			int _h;
+			int _m;
+			int _s;
+			void fix();
+			friend ostream& operator<<(ostream& o, const Duree& d);
+
+	};
+
+
+	// Operateurs binaires
+	Duree operator+(Duree& l, Duree& r);
+	Duree operator*(int l, Duree& r);
+	Duree operator*(Duree& l, int r);
+
+
+
+	#include "Duree.cpp"
+
+#endif
\ No newline at end of file
diff --git a/exec/ex5 b/exec/ex5
new file mode 100755
index 0000000..6acc3f6
Binary files /dev/null and b/exec/ex5 differ
diff --git a/exec/tp2 b/exec/tp2
index 17ca2ff..ca2e098 100755
Binary files a/exec/tp2 and b/exec/tp2 differ
diff --git a/tp2.cpp b/tp2.cpp
index f94194a..9a6cb2a 100644
--- a/tp2.cpp
+++ b/tp2.cpp
@@ -7,11 +7,13 @@ using namespace std;
 
 
 int main(){
-	ZFraction f1(1,10);
-	ZFraction f2(10);
-	ZFraction f3(10, 3);
+	ZFraction f1(1, 2);
+	ZFraction f2(1, 4);
 
-	f1.toString();
+
+
+	cout << f1 << "+" << f2 << " = " << f1+f2 << endl;
+	cout << f1 << "*" << f2 << " = " << f1*f2 << endl;
 
 	return 0;
 }
\ No newline at end of file
diff --git a/tp2/ZFraction.cpp b/tp2/ZFraction.cpp
index 848b9ba..c875daf 100644
--- a/tp2/ZFraction.cpp
+++ b/tp2/ZFraction.cpp
@@ -1,23 +1,43 @@
 /* [0] CONSTRUCTEUR
 =========================================================*/
-ZFraction::ZFraction(int a, int b) : a(a), b(b){}
+ZFraction::ZFraction(int a, int b) : _a(a), _b(b){}
 
 
 
 /* [1] Getters
 =========================================================*/
-void ZFraction::toString() const{ cout << "(" << this->a << "/" << this->b << ")"; }
+ostream& operator<<(ostream& o, const ZFraction& f){
+	o << "(" << f._a << "/" << f._b << ")";
+
+	return o;
+}
 
 
 
 /* [2] Operateurs
 =========================================================*/
 	/* (1) Addition */
-	ZFraction& operator+=(ZFraction const& x){
-		int new_a = this->a * x.b + this->b * x.a;
-		int new_b = this->b * x.b;
+	ZFraction ZFraction::operator+(const ZFraction& x) const{
+		int new_a = _a * x._b + _b * x._a;
+		int new_b = _b * x._b;
 
-		ZFraction out = ZFraction(new_a, new_b);
+		return ZFraction(new_a, new_b);
+	}
 
-		return &out;
+	ZFraction& ZFraction::operator+=(const ZFraction& x){
+		*this = *this + x;
+		return *this;
+	}
+
+	/* (2) Multiplication */
+	ZFraction ZFraction::operator*(const ZFraction& x) const{
+		int new_a = _a * x._a;
+		int new_b = _b * x._b;
+
+		return ZFraction(new_a, new_b);
+	}
+
+	ZFraction& ZFraction::operator*=(const ZFraction& x){
+		*this = *this * x;
+		return *this;
 	}
\ No newline at end of file
diff --git a/tp2/ZFraction.h b/tp2/ZFraction.h
index 1aed4ae..05e9357 100644
--- a/tp2/ZFraction.h
+++ b/tp2/ZFraction.h
@@ -11,13 +11,18 @@
 		public:
 			ZFraction(int a=1, int b=1);
 
-			void toString()       const;
 
-			ZFraction& operator+=(ZFraction const& operand);
+			ZFraction operator+(const ZFraction& x) const;
+			ZFraction& operator+=(const ZFraction& x);
+
+			ZFraction operator*(const ZFraction& x) const;
+			ZFraction& operator*=(const ZFraction& x) const;
 
 		private:
-			int a;
-			int b;
+			friend ostream& operator<<(ostream& o, const ZFraction& f);
+
+			int _a;
+			int _b;
 	};