Comp 1671
Homework 6
Assigned October 16, 2002
Due October 22, 2002

From Chapter 6 of the book:
6cde, 7, 8

Now do:
A.  Write (implement) a function that takes a single integer parameter
    representing the year (for example, 1776, 1984, 2002) and returns a
    boolean that indicates whether or not that year is a leap year.

B.  Write (implement) a function that takes three floats and returns
    a float that is the minimum of the three of them.

C.  Write a function called is_vowel that determines whether or not
    a character is a vowel.

D.  Write a function that takes 4 floats (x1, y1, x2 and y2) that together
    represent two points in the plane.  The function should return a float
    giving the straight-line distance between them.

E.  What does the following program do?  Add comments and rename variables
    to make it clear.

#include <iostream>
using namespace std;

bool hattal_oszthat(int mennyi);

int main()
{
    int szam;
    int mutatoszam;

    cout << "Please type a positive integer: ";
    cin >> szam;
    if (!cin || szam < 0) {
        cout << "Silly, user!  You did not follow directions!\n";
        return 1;
    }
    for (mutatoszam=1; mutatoszam<=szam; mutatoszam++) {
        if (hattal_oszthat(mutatoszam))
            cout << mutatoszam<< " ";
    }
    cout << endl;
    
    return 0;
}

bool hattal_oszthat(int ertek)
{
    if (ertek%3 || ertek%2)
        return false;
    else return true;
}