Q. What will be the output of this code?
Code:
void main()
{
extern int i;
i=20;
printf("%d", sizeof(i));
}
✅ Correct Answer: (D)
Linker Error
Explanation: 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.