C | Loops & Control Structure | Question 17

Predict the output of the following program:

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#include <stdio.h>
int main()
{
    int check = 20, arr[] = {10, 20, 30};
    switch (check)
    {
        case arr[0]: printf("Geeks ");
        case arr[1]: printf("Quiz ");
        case arr[2]: printf("GeeksQuiz");
    }
    return 0;
}

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(A) Quiz
(B) Quiz GeeksQuiz
(C) GeeksQuiz
(D) Compile-time error


Answer: (D)

Explanation: The case labels must be constant inside switch block. Thats why the compile-time error: case label does not reduce to an integer constant is flashed.

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