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C | Macro & Preprocessor | Question 8

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#include <stdio.h>
#define a 10
int main()
{
  printf("%d ",a);
  
  #define a 50
  
  printf("%d ",a);
  return 0;
}

                    
(A) Compiler Error (B) 10 50 (C) 50 50 (D) 10 10

Answer: (B)

Explanation: Preprocessor doesn’t give any error if we redefine a preprocessor directive. It may give warning though. Preprocessor takes the most recent value before use of and put it in place of a.

Last Updated : 06 Feb, 2013
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