In C, evaluate the values printed for enumerators with explicit and implicit assignments. #include <stdio.h> int main() { enum days { MON = -1, TUE, WED = 6, THU, FRI, SAT }; printf("%d, %d, %d, %d, %d, %d ", MON, TUE, WED, THU, FRI, SAT); return 0; }

Introduction / Context: This item assesses understanding of how C assigns values to enum constants when some are explicitly set and others are left to auto-increment from the previous value.

Given Data / Assumptions:

• MON = -1 explicitly.
• TUE is next after MON, so it becomes 0.
• WED is explicitly 6.
• THU, FRI, SAT follow WED and thus auto-increment.

Concept / Approach: The rule: an unassigned enumerator takes the previous enumerator’s value plus one. When a new explicit value appears (like WED = 6), auto-increment resumes from that value. Therefore THU = 7, FRI = 8, SAT = 9.

Step-by-Step Solution:

Verification / Alternative check: Printing the constants directly, as in the code, confirms the computed sequence without needing variables or sizeof concerns.

Why Other Options Are Wrong:

• -1, 0, 1, 2, 3, 4: Ignores WED = 6.
• -1, 2, 6, 3, 4, 5: Disrupts order and ignores the increment rule around WED.
• -1, 0, 6, 2, 3, 4: Resets incorrectly after WED.

Common Pitfalls: Assuming auto-increment continues from the earliest explicit value rather than the most recent explicit assignment. Each explicit assignment resets the running value for subsequent implicit ones.

Final Answer: -1, 0, 6, 7, 8, 9