scope resolution operator in c++

#include<iostream.h>

#include<conio.h>

int b=100;

void main()

{

clrscr();

int b=50;

{

int bh=b;

int b=25;

cout<<"we are in the inner block";

cout<<"bh="<<bh<<"\n";

cout<<"b="<<b<<"\n";

cout<<"::b="<<::b<<"\n";

}

cout<<"\nwe are int the outer block\n";

cout<<"b="<<b<<"\n";

cout<<"::b"<<::b<<"\n";

getch();

}

Output 

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