C | Macro & Preprocessor | Question 1

#include <stdio.h> 
#define PRINT(i, limit) do \ 
                        { \ 
                            if (i++ < limit) \ 
                            { \ 
                                printf("GeeksQuiz\n"); \ 
                                continue; \ 
                            } \ 
                        }while(1) 
  
int main() 
{ 
    PRINT(0, 3); 
    return 0; 
} 

How many times GeeksQuiz is printed in the above program?
(A) 1
(B) 3
(C) 4
(D) Compile-time error

Answer: (D)

Explanation: The PRINT macro gets expanded at the pre-processor time i.e. before the compilation time. After the macro expansion, the if expression becomes: if (0++ < 3). Since 0 is a constant figure and represents only r-value, applying increment operator gives compile-time error: lvalue required. lvalue means a memory location with some address.

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