Determine output void main() extern int i i=20 printf( d sizeof(i))...

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C Miscellaneous

Determine output:

void main()
{
      extern int i;
      i=20;
      printf("%d", sizeof(i));
}

A) 20 B) 2 C) Compiler Error D) Linker Error

Answer & Solution

Correct Answer: Option D

Linker error: undefined symbol '_i'. Explanation:
extern declaration specifies that the variable i is defined somewhere else. The compiler passes the external variable to be resolved by the linker. So compiler doesn't find any error. During linking the linker searches for the definition of i. Since it is not found the linker flags an error.

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Mankala Sowmyalakshmi 8 years ago

can you please explain me in the above question, why it is not seeking any compilation error??

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