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string reponse1, reponse2, reponse3, reponse4;
            int cumulatif,reponse5, reponse6, reponse8, reponse7;
            Console.WriteLine("Entrez la réponse de la question 1");
            reponse1 = Console.ReadLine();
            if (reponse1 == "b")
                Console.WriteLine("Bravo");
            else
                Console.WriteLine("Attention");
            Console.WriteLine("Entrez la réponse de la question 2");
            reponse2 = Console.ReadLine();
            if (reponse2 == "a" || reponse2 == "d")
                Console.WriteLine("Bravo");
            else
                Console.WriteLine("Attention");
            Console.WriteLine("Entrez la réponse de la question 3");
            reponse3 = Console.ReadLine();
            if (reponse3 == "c")
                Console.WriteLine("Bravo");
            else
                Console.WriteLine("Attention");
            Console.WriteLine("Entrez la réponse de la question 4");
            reponse4 = Console.ReadLine();
            if (reponse4 == "d" || reponse4 == "e")
                Console.WriteLine("Bravo");
            else
                Console.WriteLine("Attention");
 
            switch(reponse1) {
                case "b": reponse5 = 15;
                    break;
            }
            switch (reponse2)
            {
                case "a": reponse6=15;
                    break;
                case "d": reponse6 = 15;
                    break;
            }
            switch (reponse3)
            {
                case "c": reponse7 = 15;
                    break;
            }
            switch(reponse4) {
                case "d": reponse8 = 15;
                    break;
                case "e":reponse8 = 15;
                break;
 
            }
            cumulatif = reponse5 + reponse6 + reponse7 + reponse8;
 
            Console.WriteLine("Le cumulatif est de " + cumulatif+"%");
Pourquoi l'avant dernière ligne surligne les variables : reponse5, reponse6, reponse7 et reponse8 et les détectent comme erreur ?