C++ : what is :: for? -


if go accepted answer of post

could please elaborate on why uses:

double temp = ::atof(num.c_str());

and not simply

double temp = atof(num.c_str());

also, considered practice use syntax when use "pure" global functions?

it says use global version, not 1 declared in local scope. if someone's declared atof in class, this'll sure use global one.

have @ wikipedia on subject:

#include <iostream>  using namespace std;  int n = 12;   // global variable  int main() {     int n = 13;   // local variable     cout  << ::n << endl;  // print global variable: 12     cout  << n   << endl;  // print local variable: 13 }

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