diff --git a/src/C08_Structures_de_donnees/C081_Enum/App.java b/src/C08_Structures_de_donnees/C081_Enum/App.java
index 37d8487..d5b06ec 100644
--- a/src/C08_Structures_de_donnees/C081_Enum/App.java
+++ b/src/C08_Structures_de_donnees/C081_Enum/App.java
@@ -1,5 +1,8 @@
 package C08_Structures_de_donnees.C081_Enum;
 
+/**
+ * @author Rémi Heredero
+ */
 enum Glace {VANILLE, CHOCOLAT, FRAISE, MANGUE};
 // enum Cat {MINOU, CHATONS, CONNAIS_PAS_D_AUTRES, TOTO};
 public class App {
diff --git a/src/C08_Structures_de_donnees/C082_Tableaux/Exercice1.java b/src/C08_Structures_de_donnees/C082_Tableaux/Exercice1.java
index 073f5b6..01460db 100644
--- a/src/C08_Structures_de_donnees/C082_Tableaux/Exercice1.java
+++ b/src/C08_Structures_de_donnees/C082_Tableaux/Exercice1.java
@@ -1,5 +1,8 @@
 package C08_Structures_de_donnees.C082_Tableaux;
 
+/**
+ * @author Rémi Heredero
+ */
 public class Exercice1 {
     public static void main(String[] args) {
         
@@ -14,6 +17,5 @@ public class Exercice1 {
         for (String string : bar) {
             System.out.println(string);
         }
-
     }
 }
diff --git a/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/App.java b/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/App.java
index 5c844b4..926e732 100644
--- a/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/App.java
+++ b/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/App.java
@@ -1,7 +1,16 @@
 package C08_Structures_de_donnees.C083_Operations_sur_tableaux;
 
+/**
+ * @author Rémi Heredero
+ */
 public class App {
     public static void main(String[] args) throws Exception {
-        System.out.println("Hello, World!");
+        int[][] foo = new int[3][3];
+        for (int[] is : foo) {
+            for (int is2 : is) {
+                is2 = 1;
+                System.out.println(is2);
+            }
+        }
     }
 }
diff --git a/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/Exercice2.java b/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/Exercice2.java
new file mode 100644
index 0000000..b443ea9
--- /dev/null
+++ b/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/Exercice2.java
@@ -0,0 +1,56 @@
+package C08_Structures_de_donnees.C083_Operations_sur_tableaux;
+/**
+ * @author Rémi Heredero
+ * @Klagarge
+ */
+public class Exercice2 {
+    public static void main(String[] args) {
+        
+        int[] ex2_1 = {2, 5, 3, 1};
+        int grand = 0;
+        for (int i : ex2_1) {
+            grand = i>grand ? i:grand;
+        }
+        System.out.println("Exercice 2.1: " + grand);
+
+        String[] ex2_2 = {"hello", "je suis", "edmund"};
+        int e = 0;
+        for (String s : ex2_2) {
+            for (int i = 0; i < s.length(); i++) {
+                if (s.charAt(i) == 'e') {
+                    e++;
+                }
+            }
+        }
+        System.out.println("Exercice 2.2: " + e);
+
+        int[] v1 = {1,2,3};
+        int[] v2 = {4,3,2};
+        int [] sum = add(v1, v2);
+        for (int i : sum) {
+            System.out.println(i);
+        }
+
+
+
+    }
+
+    /**
+     * @author Rémi Heredero
+     * @param a tableau d'entrée a
+     * @param b tableau d'entrée b
+     * @return somme des deux tableaux d'entrée
+     */
+    public static int[] add(int[] a, int[] b) {
+        if (a.length != b.length) {
+            return null;
+        }
+
+        int[] tmp = new int[a.length];
+
+        for (int i = 0; i < tmp.length; i++) {
+            tmp[i] = a[i] + b[i];
+        }
+        return tmp;
+    }
+}
\ No newline at end of file
diff --git a/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/Exercice3.java b/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/Exercice3.java
new file mode 100644
index 0000000..fa51223
--- /dev/null
+++ b/src/C08_Structures_de_donnees/C083_Operations_sur_tableaux/Exercice3.java
@@ -0,0 +1,29 @@
+package C08_Structures_de_donnees.C083_Operations_sur_tableaux;
+
+/**
+ * @author Rémi Heredero
+ * @Klagarge
+ */
+public class Exercice3 {
+    public static void main(String[] args) {
+        
+        double[] a = {1.2, 3.2, 4.4, 5.5};
+        double[] b = {1.2, 2.1, 3.3, 2.5, 4.5};
+
+        int Ra = isSorted(a); // returns -1, the array is sorted
+        int Rb = isSorted(b); // returns 3, as 2.5 is < than 3.3
+
+        System.out.println(Ra);
+        System.out.println(Rb);
+
+    }
+
+    public static int isSorted(double[] a) {
+        for (int i = 1; i < a.length; i++) {
+            if (a[i] < a[i-1]) {
+                return i;
+            }
+        }
+        return -1;
+    }
+}