Scope resolution operator of c++ example

 Scope resolution operator example

 #include<iostream>
using namespace std;
int m=10;   //global m
int main()
{
    int m=20;  //m redeclared  local to main
    {
    int k=m;  //m declared again
    int m=30;  // local to inner block
    cout<<"we are in the inner block\n";
    cout<<"k="<< k<<"\n";    
    cout<<"m="<<m<<"\n";
    cout<<"::m="<<::m<<"\n";
        cout<<"::m="<<::m<<"\n";
    cout<<"::m="<<::m<<"\n";
    }
    cout<<"\nwe are in outer block \n";
    cout<<"m="<<m<<"\n";
    cout<<"::m="<<::m<<"\n";
        cout<<"::m="<<::m<<"\n";
    return 0;
}