+#include <stdio.h>
+
+void displayMenuEntry(int num, const char* option) {
+ printf("%d - %s\n", num, option);
+}
+
+void displayMenu() {
+ displayMenuEntry(1, "Addition");
+ displayMenuEntry(2, "Soustraction");
+ displayMenuEntry(3, "Multiplication");
+ displayMenuEntry(4, "Division");
+ displayMenuEntry(5, "Puissance");
+ displayMenuEntry(6, "Quitter");
+}
+
+int prompt(const char* msg) {
+ puts(msg);
+ int value;
+ scanf("%d", &value);
+ return value;
+}
+
+int promptUserChoice() {
+ int choice;
+ displayMenu();
+ return choice = prompt("Veuillez saisir un choix d'operation ?");
+}
+
+int doAddition(int val1, int val2) {
+ return val1 + val2;
+}
+
+int doSubstraction(int val1, int val2) {
+ return val1 - val2;
+}
+
+int doMultiplication(int val1, int val2) {
+ return val1 * val2;
+}
+
+int doDivision(int val1, int val2) {
+ if (val2 == 0) {
+ printf("Division par zero !\n");
+ //FIXME: I'm not very fond of this convention ...
+ return 0;
+ } else {
+ return val1 / val2;
+ }
+}
+
+int doPuissance(int base, int expo) {
+ int power = 1;
+ for (int iter = 0; iter < expo; iter++) {
+ power *= base ;
+ }
+ return power;
+}
+
+int doPuissanceSmart(int base, int expo) {
+ int power;
+ if (expo == 1) {
+ power = base;
+ } else if (expo % 2 == 0) {
+ power = doPuissanceSmart(base*base, expo/2);
+ } else {
+ power = base*doPuissanceSmart(base*base,(expo-1)/2);
+ }
+ return power;
+}
+
+int doPuissanceSmartIter(int base, int expo) {
+ int power = 1;
+ while (expo > 1) {
+ if (expo % 2 == 0) {
+ expo /= 2;
+ } else {
+ power *= base;
+ expo = (expo - 1) / 2;
+ }
+ base *= base;
+ }
+ return power * base;
+}
+
+int doOperation(int selection, int val1, int val2) {
+ int op_result;
+ switch (selection) {
+ case 1:
+ op_result = doAddition(val1, val2);
+ break;
+ case 2:
+ op_result = doSubstraction(val1, val2);
+ break;
+ case 3:
+ op_result = doMultiplication(val1, val2);
+ break;
+ case 4:
+ op_result = doDivision(val1, val2);
+ break;
+ case 5:
+ op_result = doPuissanceSmartIter(val1, val2);
+ break;
+ case 6:
+ break;
+ default:
+ puts("Faire un choix entre 1 et 6");
+ }
+ return op_result;
+}
+
+/* int promptValue(const char* invite) {
+ int input;
+ return input = prompt(invite);
+} */
+
+void promptValue(const char* invite, int* value) {
+ puts(invite);
+ scanf("%d", value);
+}
+
+void promptBothValues(int* val1, int* val2) {
+ promptValue("Veuillez saisir la premiere valeur", val1);
+ promptValue("Veuillez saisir la deuxieme valeur", val2);
+}
+
+int main() {
+ int choiceresult, value1, value2, result;
+ for (;;) {
+ choiceresult = promptUserChoice();
+ if (choiceresult == 6) break;
+ promptBothValues(&value1, &value2);
+ result = doOperation(choiceresult, value1, value2);
+ printf("Le resultat est %d\n", result);
+ printf("\n");
+ }
+}