Cleanups.

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

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

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

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

void displayMenu() {
    displayMenuEntry(1, "Addition");
    displayMenuEntry(2, "Substraction");
    displayMenuEntry(3, "Multiplication");
    displayMenuEntry(4, "Exit");
}

/** Prompt the user for his operation choice.
 *
 * @return The selected operation. No invalid value can be returned.
 */
int promptOperation() {
    displayMenu();
    int result;

    do {
        result = promptValue("Choose an option");

        if (result >= 1 && result <= 4) {
            break;
        }

        puts("Please choose a valid option (1-4)");
    } while (true);

    return result;
}

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

    if (operation == 4) {
        return 0;
    }

    int initialValue = promptValue("Initial value");

    do {
        int nextValue = promptValue("Next value");

        if (nextValue == 0) {
            break;
        }

        switch (operation) {
        // Addition
        case 1:
            initialValue += nextValue;
            break;

        // Substraction
        case 2:
            initialValue -= nextValue;
            break;

        // Multiplication
        case 3:
            initialValue *= nextValue;
            break;
        }

        printf("Result: %d\n", initialValue);
    } while (true);
}