TP_7/exo2/exo2.c

   1 #include <stdio.h>
   2 #include <stdbool.h>
   3
   4 //FIXME: Comment the code !!!
   5
   6 void displayMenuEntry(int num, const char* option) {
   7     printf("%d - %s\n", num, option);
   8 }
   9
  10 void displayMenu() {
  11     displayMenuEntry(1, "Addition");
  12     displayMenuEntry(2, "Soustraction");
  13     displayMenuEntry(3, "Multiplication");
  14     displayMenuEntry(4, "Division");
  15     displayMenuEntry(5, "Puissance");
  16     displayMenuEntry(6, "Quitter");
  17 }
  18
  19 int promptValue(const char* invite) {
  20     int value = 0;
  21     puts(invite);
  22     scanf("%d", &value);
  23     return value;
  24 }
  25
  26 int promptOperation() {
  27     displayMenu();
  28     return promptValue("Veuillez choisir une operation ?");
  29 }
  30
  31 int doAddition(int val1, int val2) {
  32     return val1 + val2;
  33 }
  34
  35 int doSubstraction(int val1, int val2) {
  36     return val1 - val2;
  37 }
  38
  39 int doMultiplication(int val1, int val2) {
  40     return val1 * val2;
  41 }
  42
  43 int doDivision(int val1, int val2) {
  44     //FIXME: Useless code path given the exit main loop condition
  45     if (val2 == 0) {
  46         printf("Division par zero !\n");
  47         // FIXME: I'm not very fond of this convention ...
  48         return 0;
  49     } else {
  50         return val1 / val2;
  51     }
  52 }
  53
  54 int doPuissance(int base, int expo) {
  55     int power;
  56     if ( expo == 1) {
  57         power = base;
  58     } else if ( expo % 2 == 0 ) {
  59         power = doPuissance(base*base, expo/2);
  60     } else {
  61         power = base*doPuissance(base*base,(expo-1)/2);
  62     }
  63     return power;
  64 }
  65
  66 int doOperation(int selection, int val1, int val2) {
  67     int op_result;
  68     switch (selection) {
  69         case 1:
  70             op_result = doAddition(val1, val2);
  71             break;
  72         case 2:
  73             op_result = doSubstraction(val1, val2);
  74             break;
  75         case 3:
  76             op_result = doMultiplication(val1, val2);
  77             break;
  78         case 4:
  79             op_result = doDivision(val1, val2);
  80             break;
  81         case 5:
  82             op_result = doPuissance(val1, val2);
  83             break;
  84         case 6:
  85             break;
  86         default:
  87             puts("Faire un choix compris entre 1 et 6");
  88     }
  89     return op_result;
  90 }
  91
  92 int main() {
  93     int choice = promptOperation();
  94     int value1 = promptValue("Veuillez saisir une valeur entiere initiale ?");
  95     int value2 = 0, result = 0;
  96     bool first_loop = true;
  97
  98     for (;;) {
  99         if (choice == 6) break;
 100         if (first_loop) {
 101             value2 = promptValue("Veuillez saisir une valeur entiere avec laquelle l'operation sera effectuee ?");
 102             if (value2 == 0) break;
 103             result = doOperation(choice, value1, value2);
 104             first_loop = false;
 105         } else {
 106             value2 = promptValue("Veuillez saisir la prochaine valeur entiere avec laquelle l'operation sera effectuee sur l'ancien resultat ?");
 107             if (value2 == 0) break;
 108             result = doOperation(choice, result, value2);
 109         }
 110         printf("Le resultat de l'operation choisie est %d\n\n", result);
 111     }
 112
 113     return 0;
 114 }