C | Macro & Preprocessor | Question 5

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#include <stdio.h>
#define ISEQUAL(X, Y) X == Y
int main()
{
    #if ISEQUAL(X, 0)
        printf("Geeks");
    #else
        printf("Quiz");
    #endif
    return 0;
}

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Output of the above program?

(A) Geeks

(B) Quiz

(C) Any of Geeks or Quiz

(D) Compile time error



 Answer: (A) 

Explanation: The conditional macro #if ISEQUAL(X, 0) is expanded to #if X == 0. After the pre-processing is over, all the undefined macros are initialized with default value 0. Since macro X has not been defined, it is initialized with 0. So, Geeks is printed.


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