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What will be the output of the following C code?

#include <stdio.h>
#define max 20
main()
{
    #ifndef max
    #define min 10
    #else
    #define min 30
    #endif
    printf("%d",min);
}

 

  • A.10
  • B.20
  • C.30
  • D.error

Answer: C

Correct answer: 30

max is defined, so #ifndef max is false and the #else branch is taken, defining min as 30. The program prints 30.

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