C | Macro & Preprocessor | Question 2
C
#include <stdio.h>
#if X == 3
#define Y 3
#else
#define Y 5
#endif
int main()
{
printf (\"%d\", Y);
return 0;
}
|
What is the output of the above program?
(A)
3
(B)
5
(C)
3 or 5 depending on value of X
(D)
Compile time error
Answer: (B)
Explanation:
In the first look, the output seems to be compile-time error because macro X has not been defined. In C, if a macro is not defined, the pre-processor assigns 0 to it by default. Hence, the control goes to the conditional else part and 5 is printed. See the next question for better understanding.
Quiz of this Question
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Last Updated :
02 Feb, 2013
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