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[TD_C.git] / TP_7 / exo2 / exo2.c

#include <stdio.h>
#include <stdbool.h>

//FIXME: Comment the code !!!

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 promptValue(const char* invite) {
    int value = 0;
    puts(invite);
    scanf("%d", &value);
    return value;
}

int promptOperation() {
    displayMenu();
    return promptValue("Veuillez choisir une 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) {
    //FIXME: Useless code path given the exit main loop condition
    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;
    if ( expo == 1) {
        power = base;
    } else if ( expo % 2 == 0 ) {
        power = doPuissance(base*base, expo/2);
    } else {
        power = base*doPuissance(base*base,(expo-1)/2);
    }
    return power;
}

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 = doPuissance(val1, val2);
            break;
        case 6:
            break;
        default:
            puts("Faire un choix compris entre 1 et 6");
    }
    return op_result;
}

int main() {
    int choice = promptOperation();
    int value1 = promptValue("Veuillez saisir une valeur entiere initiale ?");
    int value2 = 0, result = 0;
    bool first_loop = true;

    for (;;) {
        if (choice == 6) break;
        if (first_loop) {
            value2 = promptValue("Veuillez saisir une valeur entiere avec laquelle l'operation sera effectuee ?");
            if (value2 == 0) break;
            result = doOperation(choice, value1, value2);
            first_loop = false;
        } else {
            value2 = promptValue("Veuillez saisir la prochaine valeur entiere avec laquelle l'operation sera effectuee sur l'ancien resultat ?");
            if (value2 == 0) break;
            result = doOperation(choice, result, value2);
        }
        printf("Le resultat de l'operation choisie est %d\n\n", result);
    }

    return 0;
}