#include <iostream.h>

void calc(float, float, float, float&, float&);  // prototype

int main()
{
  float firstnum, secnum, thirdnum, sum, product;

  cout << "Enter three numbers: ";
  cin  >> firstnum >> secnum >> thirdnum;

  calc(firstnum, secnum, thirdnum, sum, product);  // function call

  cout << "\nThe sum of the numbers is: " << sum << endl;
  cout << "The product of the numbers is: " << product << endl;

  return 0;
}

void calc(float num1, float num2, float num3, float& total, float& product)
{
  total = num1 + num2 + num3;
  product = num1 * num2 * num3;
  return;
}