| 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 | } |