TP_4/tp4.c

   1 #include <stdio.h>
   2
   3 void displayMenuEntry(int num, const char* option) {
   4     printf("%d - %s\n", num, option);
   5 }
   6
   7 void displayMenu() {
   8     displayMenuEntry(1, "Addition");
   9     displayMenuEntry(2, "Soustraction");
  10     displayMenuEntry(3, "Multiplication");
  11     displayMenuEntry(4, "Division");
  12     displayMenuEntry(5, "Puissance");
  13     displayMenuEntry(6, "Quitter");
  14 }
  15
  16 int prompt(const char* msg) {
  17     puts(msg);
  18     int value;
  19     scanf("%d", &value);
  20     return value;
  21 }
  22
  23 int promptUserChoice() {
  24     int choice;
  25     displayMenu();
  26     return choice = prompt("Veuillez saisir un choix d'operation ?");
  27 }
  28
  29 int doAddition(int val1, int val2) {
  30     return val1 + val2;
  31 }
  32
  33 int doSubstraction(int val1, int val2) {
  34     return val1 - val2;
  35 }
  36
  37 int doMultiplication(int val1, int val2) {
  38     return val1 * val2;
  39 }
  40
  41 int doDivision(int val1, int val2) {
  42     if (val2 == 0) {
  43         printf("Division par zero !\n");
  44         //FIXME: I'm not very fond of this convention ...
  45         return 0;
  46     } else {
  47         return val1 / val2;
  48     }
  49 }
  50
  51 int doPuissance(int base, int expo) {
  52     int power = 1;
  53     for (int iter = 0; iter < expo; iter++) {
  54         power *= base;
  55     }
  56     return power;
  57 }
  58
  59 int doPuissanceSmart(int base, int expo) {
  60     int power;
  61     if (expo == 1) {
  62         power = base;
  63     } else if (expo % 2 == 0) {
  64         power = doPuissanceSmart(base*base, expo/2);
  65     } else {
  66         power = base*doPuissanceSmart(base*base,(expo-1)/2);
  67     }
  68     return power;
  69 }
  70
  71 int doPuissanceSmartIter(int base, int expo) {
  72     int power = 1;
  73     while (expo > 1) {
  74         if (expo % 2 == 0) {
  75             expo /= 2;
  76         } else {
  77             power *= base;
  78             expo = (expo - 1) / 2;
  79         }
  80         base *= base;
  81     }
  82     return power * base;
  83 }
  84
  85 int doOperation(int selection, int val1, int val2) {
  86     int op_result;
  87     switch (selection) {
  88         case 1:
  89             op_result = doAddition(val1, val2);
  90             break;
  91         case 2:
  92             op_result = doSubstraction(val1, val2);
  93             break;
  94         case 3:
  95             op_result = doMultiplication(val1, val2);
  96             break;
  97         case 4:
  98             op_result = doDivision(val1, val2);
  99             break;
 100         case 5:
 101             op_result = doPuissanceSmartIter(val1, val2);
 102             break;
 103         case 6:
 104             break;
 105         default:
 106             puts("Faire un choix entre 1 et 6");
 107     }
 108     return op_result;
 109 }
 110
 111 /* int promptValue(const char* invite) {
 112     int input;
 113     return input = prompt(invite);
 114 } */
 115
 116 void promptValue(const char* invite, int* value) {
 117     puts(invite);
 118     scanf("%d", value);
 119 }
 120
 121 void promptBothValues(int* val1, int* val2) {
 122     promptValue("Veuillez saisir la premiere valeur", val1);
 123     promptValue("Veuillez saisir la deuxieme valeur", val2);
 124 }
 125
 126 int main() {
 127     int choiceresult, value1, value2, result;
 128     for (;;) {
 129         choiceresult = promptUserChoice();
 130         if (choiceresult == 6) break;
 131         promptBothValues(&value1, &value2);
 132         result = doOperation(choiceresult, value1, value2);
 133         printf("Le resultat est %d\n", result);
 134         printf("\n");
 135     }
 136 }