Cleanups.

[TD_C.git] / TP_7_C / exo2-extra.c

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

/** Pointer to a function with this profile */
typedef int(*operation_cb)(int v1, int v2);

/** Describe a single operation */
typedef struct {
    const char* label;
    operation_cb cb;
} operation_t;

int doAddition(int v1, int v2);
int doSubstraction(int v1, int v2);
int doMultiplication(int v1, int v2);
int doXOR(int v1, int v2);

/** All available operations */
operation_t operations[4] = {
    {
        "Addition",
        doAddition
    },
    {
        "Substraction",
        doSubstraction
    },
    {
        "Multiplication",
        doMultiplication
    },
    {
        "XOR",
        doXOR
    }
};
#define operations_count ((int) (sizeof(operations) / sizeof(operations[0])))

/** Display a prompt to the user then wait for an integer input. */
void promptValue(const char* prompt, int* value) {
    printf("%s:\n", prompt);
    scanf("%d", value);
}

void displayMenuEntry(int index, const char* label) {
    printf("%d | %s\n", index, label);
}

/** Display all available operations and an EXIT option. */
void displayMenu() {
    for (int menuIndex = 0; menuIndex < operations_count; ++menuIndex) {
        displayMenuEntry(menuIndex + 1, operations[menuIndex].label);
    }

    displayMenuEntry(operations_count + 1, "Exit");
}

/** Prompt the user for his operation choice.
 *
 * @return The selected operation. If the exit option is chosen, return NULL
 */
operation_t* promptOperation() {
    displayMenu();

    do {
        int result;
        promptValue("Choose an option", &result);

        if (result == (operations_count + 1)) {
            return NULL;
        }

        if (result >= 1 && result <= operations_count) {
            return &operations[result - 1];
        }

        printf("Please choose a valid option (1-%d)\n", operations_count);
    } while (true);
}

int doAddition(int v1, int v2) {
    return v1 + v2;
}

int doSubstraction(int v1, int v2) {
    return v1 - v2;
}

int doMultiplication(int v1, int v2) {
    return v1 * v2;
}

int doXOR(int v1, int v2) {
    return v1 ^ v2;
}

int main() {
    operation_t* operation = promptOperation();

    if (operation == NULL) {
        return 0;
    }

    int initialValue;
    promptValue("Initial value", &initialValue);

    do {
        int nextValue;
        promptValue("Next value", &nextValue);

        if (nextValue == 0) {
            break;
        }

        initialValue = operation->cb(initialValue, nextValue);
        printf("Result: %d\n", initialValue);
    } while (true);
}