Inbuilt gcd A B function in C

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I recently learned about a c++ special function called __gcd (A,B). 

The greatest common divisor of A and B will be returned.

#include<iostream>
#include<algorithm>
using namespace std;

main()
{
cout<<__gcd(10,40); //op: 10
}

Is there a reason why the function definition begins with two underscores?

Like other STL functions, it might be as easy as gcd(A,B).

Jul 11 in C++ by Nicholas
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