# include <stdio.h>

void function_one ( int n );
void function_two ( int *n );

int main ( )
{
  int n;

  n = 123;

  printf ( "\n" );
  printf ( "Before calling function_one(n), n = %d\n", n );
  function_one ( n );
  printf ( "After  calling function_one(n), n = %d\n", n );

  printf ( "\n" );
  printf ( "Before calling function_two(&n), n = %d\n", n );
  function_two ( &n );
  printf ( "After  calling function_two(&n), n = %d\n", n );
  
  return 0;
}

void function_one ( int n )
{
  n = n + 1;
  return;
}

void function_two ( int *n )
{
  *n = *n + 1;
  return;
}