cleaned some warnings. a lot remain though

source_codes/arbres_binaires/arbre_binaire.c

@@ -107,6 +107,8 @@ bool arbre_delete(arbre *tree, int cle) {
         nd->key = val;
         return true;
     }
+
+    return false;
 }
 
 void arbre_print(arbre tree, int N) {

source_codes/arbres_binaires/bin_tree.c

@@ -130,6 +130,7 @@ bool arbre_delete_bis(arbre *tree, cle c) {
             return true;
         }
     }
+    return false;
 }
 
 void arbre_print(arbre tree, int N) {

source_codes/arbres_binaires/bin_tree_main.c

@@ -4,19 +4,20 @@
 #include <stdlib.h>
 
 void main() {
-    bool b;
-    int val;
+    bool b     = false;
     arbre tree = NULL;
     arbre_print(tree, 1);
     do {
         printf("insert val = ");
+        int val;
         scanf("%d", &val);
-        b = arbre_insert(&tree, val);
+        b = arbre_insert(tree, val);
         arbre_print(tree, 1);
     } while (b);
     node *nd;
     do {
         printf("delete val = ");
+        int val;
         scanf("%d", &val);
         b = arbre_delete(&tree, val);
         arbre_print(tree, 1);

source_codes/arbres_binaires/bin_tree_part.c

@@ -86,6 +86,7 @@ bool arbre_delete(arbre *tree, int cle) {
             return true;
         }
     }
+    return false;
 }
 
 void arbre_print(arbre tree, int N) {