const int perplexed = 2; #define perplexed 3 main() { #ifdef perplexed #undef perplexed #define perplexed 4 #endif printf("%d",perplexed); }

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Question :
const int perplexed = 2;
#define perplexed 3
main()
{
#ifdef perplexed
#undef perplexed
#define perplexed 4
#endif
printf("%d",perplexed);
}

Category C Interview Questions

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Added on 7/18/2006

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Answers:

Ans will be two not 4 as that value perplexed is const variable and a const can not be changed

I am sorry to say that though its a const variable we can change its value. I am working on DEVC++ compiler.

I got ans as 4

We are defining the perplexed value outside main().Later inside main, using #ifdef we are checking whether perplexed is defined or not. If it is defined then undefine it using (#undef)and again we are defining it using #define.

Hence the answer is 4.(I worked on on Dev c++)

Posted by: Syed Baseer Ahmed

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