// Program that tries to get two float values out of a function set_cons
// This one fails because of the default "pass-by-value" mechanism
//
#include <iostream.h>

void set_cons(float pi, float e)
{
  pi=3.141593;
  e=2.718282;
  cout << "In function set_cons: pi = " << pi << "; e = " << e << endl;
}

void main(void)
{
  float pi = 0.; // declare pi and set it first to zero
  float e  = 0.; // declare e  and set it first to zero

  cout << "In function main: pi = " << pi << "; e = " << e << endl;

  // We want to set the correct values of pi and e:
  set_cons(pi, e);    // This is NOT going to work: *pass-by-value* error

  cout << "In function main: pi = " << pi << "; e = " << e << endl;
}