#include <cilk/cilk.h>
#include <stdio.h>
#include <time.h>

int main() {
    int i = 2;
    printf("Write %d as ", i);
    
    switch (i) {
        case 1:
            printf("one\n");
            break;
        case 2:
            printf("two\n");
            break;
        case 3:
            printf("three\n");
            break;
        default:
            printf("unknown\n");
    }

    // You can use commas to separate multiple expressions in the same `case` statement. We use the optional `default` case in this example as well.
    time_t now = time(NULL);
    struct tm *tm_struct = localtime(&now);

    // Weekday starts from 0 (Sunday) to 6 (Saturday)
    switch (tm_struct->tm_wday) {
        case 0: // Sunday
        case 6: // Saturday
            printf("It's the weekend\n");
            break;
        default:
            printf("It's a weekday\n");
    }

    // `switch` without an expression is an alternate way to express if/else logic. Here we also show how the `case` expressions can be non-constants.
    switch (0) {
        case 0 ... 11: // Using range for representing time before noon
            if (tm_struct->tm_hour < 12) {
                printf("It's before noon\n");
            } else {
                printf("It's after noon\n");
            }
            break;
    }

    // A type `switch` compares types instead of values. You can use this to discover the type of an interface value. In this example, the variable will have the type corresponding to its clause.
    void *item;
    item = (void*)1; // Example item. In real scenarios, this might come from somewhere else.

    switch (*(int*)&item) {
        case 0:
            printf("I'm a bool\n");
            break;
        case 1:
            printf("I'm an int\n");
            break;
        default:
            printf("Don't know type\n");
    }
}