error: extern declaration of 'i' follows declaration with no linkage

Question

In the following program, I thought that extern int i; will change the following i to refer to the i defined outside main

Answer 1

#include 

int i=1;  // external variable

int main()
{
    int i=2;            // local variable
    printf("%d\n", i);  // print local variable i==2

    {
    extern int i;       // point to external variable
    printf("%d\n", i);  // print external variable i==1
    }

    return 0;
}