Challenge 2: A switch Demonstrating Fallthrough, Then Fixed — Possible Solution
====================================================================

BROKEN VERSION (deliberate missing break):

#include <stdio.h>

int main() {
    int day = 1;
    switch (day) {
        case 1:
            printf("Monday\n");
            // missing break -- falls through
        case 2:
            printf("Tuesday\n");
            break;
        case 3:
            printf("Wednesday\n");
            break;
    }
    return 0;
}

Output with day = 1:

    Monday
    Tuesday

Even though day is 1, "Tuesday" prints too -- execution falls straight
through case 1 into case 2's code, since nothing stopped it.

FIXED VERSION:

    switch (day) {
        case 1:
            printf("Monday\n");
            break;    // <-- added
        case 2:
            printf("Tuesday\n");
            break;
        case 3:
            printf("Wednesday\n");
            break;
    }

Output with day = 1 now:

    Monday

WHY THIS WORKS AS AN ANSWER
------------------------------
This demonstrates fallthrough concretely (day = 1 printing BOTH
"Monday" and "Tuesday") rather than just describing it abstractly, and
the fix is the single missing break -- exactly what the chapter's
warn-box identifies as the dangerous default to guard against every
single case.