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Question

What is the output of C program with #undef? 
#define BIRD 5
int main()
{
    #ifdef BIRD
        printf("BIRD=5.");
    #else
        printf("UNKNOWN.");
    #endif
    #undef BIRD
    #define BIRD 10
    printf("BIRD=%d",BIRD);
    return 0;
}

a.

BIRD=5.BIRD=5

b.

BIRD=10.BIRD=10

c.

BIRD=5.BIRD=10

d.

Compiler error

Posted under C Programming

Answer: (c).BIRD=5.BIRD=10

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Q. What is the output of C program with #undef?
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