// Public domain / CC0. Use freely for any purpose. RoyR 2026
// switch.cm - Switch statement demonstration
// Demonstrates: switch/case, default, break, fall-through

void printf(uint8 *fmt);

uint8 *get_day_name(int32 day) {
    switch (day) {
        case 0: return "Sunday";
        case 1: return "Monday";
        case 2: return "Tuesday";
        case 3: return "Wednesday";
        case 4: return "Thursday";
        case 5: return "Friday";
        case 6: return "Saturday";
        default: return "Invalid day";
    }
}

int32 is_weekend(int32 day) {
    switch (day) {
        case 0:
        case 6:
            return 1;
        default:
            return 0;
    }
}

uint8 *get_grade(int32 score) {
    int32 category = score / 10;
    
    switch (category) {
        case 10:
        case 9:
            return "A";
        case 8:
            return "B";
        case 7:
            return "C";
        case 6:
            return "D";
        default:
            return "F";
    }
}

int32 main(void) {
    printf("Days of the week:\n");
    for (int32 i = 0; i < 8; i = i + 1) {
        printf("  Day %d: %s", i, get_day_name(i));
        if (is_weekend(i)) {
            printf(" (weekend!)");
        }
        printf("\n");
    }
    
    printf("\nGrade calculator:\n");
    int32 scores[6] = { 95, 87, 76, 65, 54, 100 };
    for (int32 i = 0; i < 6; i = i + 1) {
        printf("  Score %d: Grade %s\n", scores[i], get_grade(scores[i]));
    }
    
    return 0;
}