void
FormLetter(string first,string last, string address, int age)
{
    cout << "Dear " << first << "," << endl << endl;
    cout << "Now that you're " << age << " years old you ";
    cout << "need to provide " << endl;
    cout << "for the " << last << " family.  Invest for the future, "  
	<< first << ","<< endl;
    cout << "Make life at " << address
	<< " happy: give us money today!" << endl << endl << endl;
}

bool IsAbundant(double a, double b, double c)
// precondition: a, b, c are lengths of sides of a triangle
// postcondition: returns true if triangle is abundant, otherwise
//                returns false
{
    double perim = a+b+c;
    double semi = 0.5*perim;
    double area = sqrt(semi * (semi - a) * (semi - b) * (semi - c));

    return perim > area;
}

int TotalMoves()
// postcondition: returns sum of rolling two six-sided dice
//                where dice are rolled until doubles are NOT thrown
{
    Dice d(6);
    int first = d.Roll();
    int second = d.Roll();
    int total = first + second;     // sum of first two to start

    while (first == second)
    {
	first = d.Roll();
	second = d.Roll();
	total += first + second;
    }
    return total;
}

int Reverse(int val)
//precondition: 0 < val
//postcondition: returns number whose digits are reverse of val's digits
{
    int rev = 0;
    int digit;
    
    while (val > 0)
    {
	digit = val % 10;        // get ones digit
	rev = rev * 10 + digit;  // build number up
	val /= 10;               // chop off last digit
    }
    return rev;
}

#include <iostream.h>
#include <fstream.h>             // for class ifstream
#include "dukestudent.h"         // for class DukeStudent
  
main()
{
    DukeStudent student;

    ifstream flexfile;
    string filename;
    string ssn;
    double expense;

    cout << "enter name of file: ";
    cin >> filename;
    flexfile.open(filename);

    flexfile >> ssn;              // first line is soc-sec. number
    student.Init(ssn);

    cout << "name is " << student.Name() << endl;
    cout << "initial Flex balance = $" << student.Flex() << endl;

    while (flexfile >> expense)
    {
	student.AddToFlex(-1 * expense);   // deduct expenses
    }
    cout << "after expenses balance = $" << student.Flex() << endl;
}

main()
{
    int maxRun = 0;            // longest run length
    int maxValue = 0;          // longest run value
    int run = 0;               // current run length
    int roll;                  // current roll
    int lastRoll = 0;          // last value rolled
    int k;
    Dice d(12);

    for(k=0; k < 1000000; k += 1)
    {	
	roll = d.Roll();
	if (roll == lastRoll)
	{
	    run += 1;            // current run is longer
	}
	else
	{
	    run = 1;             // start a new run, length is 1
	}
	if (run > maxRun)        // current run larger than max so far?
	{
	    maxRun = run;
	    maxValue = roll;
	}
	lastRoll = roll;
    }
    cout << "longest run = " << maxRun << " value rolled = ";
    cout << maxValue << endl;
}