Petite question en c++ , svp !!!

#include<iostream.h>

void f(int, int=12);

void f(int a, int b)
{
cout<<"arugument 1 ="<<a<<endl;
cout<<"arugument 2 ="<<b<<endl;
}

void main()
{
int n=5;
int p=10;
f(n,p);
f(n);

}

il affiche :
1/   arugument 1 =5 
2/   arugument 2 =10
3/   arugument 1 =5
4/   arugument 2 =12

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