C | Variable Declaration and Scope | Question 3
#include <stdio.h> extern int var; int main() { var = 10; printf("%d ", var); return 0; } |
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(A) Compiler Error: var is not defined
(B) 20
(C) 0
Answer: (A)
Explanation: var is only declared and not defined (no memory allocated for it)
Refer: Understanding “extern” keyword in C
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