push ex4 and ex5

exercises/using-pmd.md

@@ -4,11 +4,13 @@ Pick a Java project from Github (see the [instructions](../sujet.md) for suggest
 
 ## Answer
 
-We clone the project `commons-math`
+Nous avons cloné le projet `commons-math`
 https://github.com/apache/commons-math
-We found a problem that it's not worth to change 
+
+On a trouvé un problème qu’il ne vaut pas la peine de changer :
 `./commons-math/commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMath.java:396:	UselessParentheses:	Useless parentheses around `0.5 * t`.`
-And here is the code that PMD a indiqué: 
+
+Et voici le code que PMD a indiqué:
 ```
             if (x >= LOG_MAX_VALUE) {
                 // Avoid overflow (MATH-905).
@@ -16,9 +18,9 @@ And here is the code that PMD a indiqué:
                 return (0.5 * t) * t;
 ```
 
-As we can see the parentheses didn't cause any harm here but it is a true positive
+Comme on peut le voir, les parenthèses ne causent aucun problème ici, mais c’est un vrai positif.
 
-For a false positive, we found this one: 
+Pour un faux positif, nous avons trouvé celui-ci:
 `./commons-math/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/IntegerSequenceTest.java:255:	UnusedLocalVariable:	Avoid unused local variables such as 'inc'.`
 
 ```
@@ -33,4 +35,6 @@ For a false positive, we found this one:
 
 ```
 
-Because the purpose of the test is to trigger the bug when create object.
+
+
+Parce que le but du test est de déclencher le bug lors de la création de l’objet.