Use a reference parameter. : pointer reference « Pointer « C++ Tutorial

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11.8.2.Use a reference parameter.

#include <iostream>

using namespace std;

   

void neg(int &i); // i now a reference

   

int main()

{

  int x;

   

  x = 10;

  cout << x << " negated is ";

   

  neg(x); // no longer need the & operator

  cout << x << "\n";

   

  return 0;

}

   

void neg(int &i)

{

  i = -i; // i is now a reference, don't need *

}

11.8.pointer reference
	11.8.1.	Use reference type eliminates the more confusing pointer notation.
	11.8.2.	Use a reference parameter.
	11.8.3.	uses reference parameters to swap the values of the variables it is called with

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