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#include <stdio.h>
 
int main(void)
{
    {
        extern int i;
        int i=20;
        {
            const volatile unsigned i=30; printf("%d",i);
        }
        printf("%d",i);
    }
printf("%d",i);
}
int i;

prog.c: In function ‘main’:
prog.c:7:13: error: declaration of ‘i’ with no linkage follows extern declaration
         int i=20;
             ^
prog.c:6:20: note: previous declaration of ‘i’ was here
         extern int i;
                    ^
prog.c:13:13: error: ‘i’ undeclared (first use in this function)
 printf("%d",i);
             ^
prog.c:13:13: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty