update exo

exo echange deux valeurs.txt

@@ -0,0 +1,33 @@
+a entier
+b entier
+
+c entier
+
+debut
+
+a = 5
+b = 7
+
+c = a           //c = 5
+a = b           //a = 7
+b = c           //b = 5
+
+
+fin
+
+-----------------------------
+
+a entier
+b entier
+
+debut
+
+a = 5
+b = 7
+
+b = b - a       //b = 2
+a = a + b       //a = 7
+b = a - b       //b = 5
+
+
+fin