Passing unnamed arguments in functions

It is possible to pass an unnamed argument in C++ function. The unnamed argument indicates that argument is unused. Typically unnamed arguments arise from the simplification of code or from planning ahead for extensions. In either case, leaving the argument in place, although unused, ensures that the callers are not affected by the change. Simple example as follows:

//Program tested on Microsoft Visual Studio 2008 - Zahid Ghadialy
//Simple example of unnamed arguments
#include<iostream>

using namespace std;

void someFunc(int a, int)
{
  cout<<"Only a is defined to "<<a<<endl;
  cout<<"The second argument is dummy"<<endl;
}

int main()
{
  someFunc(15, 100); //100 is dummy

  cout<<endl;
  return 0;
}

The output is as follows: