Objective

The objective of this assignment is to get you familiar with good design practices, writing in C++ in a Borland environment, and using functions. It may also heighten your appreciation of mathematics

Background

The study of mathematics is separated into many fields. The one that tends to lead students to discover the beauty of mathematics is the field of number theory. This field deals with numbers and their relationships to each other.

The field of number theory has lead to discoveries such as :

Prime numbers -- those which can only be divided by themselves and one. Some special primes that you might find interesting are of the form 2p - 1, where p is prime. These are called Mersenne Primes after the French monk Marin Mersenne who discovered them. The search for Mersenne primes continues. You can participate in the search for new Mersenne primes by joining GIMPS (the Great Internet Mersenne Prime Search). The 39th and largest known Mersenne prime is 213466917 - 1. It was just discovered on November 14, 2001.

· Perfect numbers -- ancient mathematicians were interested in the relationship of a number and the sum of its divisors. A positive integer that is equal to the sum of its divisors (excluding itself) is called a "perfect" number. For example, the divisors of 6 are 1, 2 and 3. Since 6 = 1 + 2 + 3, 6 is a perfect number. The next three perfect numbers are 28, 496 and 8128. If the sum of the divisors is greater than the number, the number is called "abundant". If the sum of the divisors is less than the number, the number is called "deficient". Perfect numbers demonstrate some interesting properties -- all known perfect numbers end in 6 or 8; there are no known odd perfect numbers. Mersenne primes and perfect numbers are closely related.

· Squares -- many positive integers are considered geometric in nature. You learned about perfect squares in high school -- 1, 4, 9, 16. They are called "squares" because a group of 1, 4, 9 or 16 dots can be arranged in a square.

· Triangular numbers -- Groups of 1, 3, or 6 dots can be arranged in a triangle and so these numbers are called "triangular" numbers. (If you've ever gone bowling, you'll recognize that 10 is also triangular.)

A more natural example arises when we consider a group of people who meet for the first time and everyone shakes hands with everyone else. The number of handshakes will be a triangular number.

Turns out that triangular numbers are the sum of consecutive integers.

o 1 = 1

o 3 = 1 + 2

o 6 = 1 + 2 + 3

o 10 = 1 + 2 + 3 + 4

To us this may just be an interesting relationship. To early Pythagoreans, it showed the mysterious nature of the universe and the way in which numbers and shapes have esoteric relationships.

Positive integers can be categorized in many different ways. This project will let you investigate some familiar and some new ways of looking at integers.

Coding Specifications

Your mission is to write a program that examines positive integers within a range that the user specifies and categorizes them as follows:

1. ODD or EVEN

2. PRIME or COMPOSITE -- a prime number is an integer greater than one that is divisible only by itself and one. Any number that is not "prime" is "composite".

3. PERFECT/ABUNDANT/DEFICIENT --- as described above

4. SQUARE -- as described above

5. TRIANGULAR -- as described above

Your program will also count the number of integers in the specified range that fall into each category and print a summary at the end. You should restrict the user to positive integers between 1 and 100000, inclusive. The ending number specified by the user should always be greater than or equal to the starting number s/he chose. You must validate the user's input. I guarantee that all input used to test your program will be of type int.

Your program MUST include the following functions. Do NOT change the functions prototypes given below. You may choose to use more functions if you wish, but these are sufficient. All "predicate" functions below should return 1 for TRUE and 0 for FALSE. You have some flexibility in implementing the other functions.

void PrintGreeting (void); -- displays a suitable greeting to the user

int GetValidInt (int min, int max); -- gets an integer from the user between min and max, inclusive and returns that valid integer.

void PrintTableHeading (void); -- prints the heading of the table

int IsOdd (int n); -- a predicate function that returns TRUE if n is Odd and returns FALSE if it is not.

int IsPrime (int n); -- a prediate funtion that returns TRUE if n is prime, and FALSE if it is not

int CheckForPerfect (int n); -- classifies n as "perfect", "abundant" or "deficient". A different value is returned for each different category.

int SumDivisors (int n); -- returns the sum of the divisors of n.

int IsDivisor (int a, int b); -- a predicate function that returns TRUE if a is a divisor of b, and FALSE if not

int IsSquare (int n); -- returns TRUE if n is a perfect square, FALSE if not

int IsTriangular (int n); -- returns TRUE if n is a triangular number, FALSE if not

void PrintTableLine (int n, int odd, int prime, int perfect, int square, int triangular); -- prints the information for one number on one line of the table

void PrintTotals (int first, int last, int numOdd, int numEven, int numPrime, int numComposite, int numDeficient, int numPerfect, int numAbundant, int numSquare, int numTriangular); -- prints the summary of the number of different classifications found in the range specified.

Sample Run

This program classifies positive integers as

Odd/Even, Prime/Composite, Perfect/Abundant/Deficient, Square, and Triangular

You will now get to choose the range of positive integers that

you would like to see classified.

Start with which positive integer ?

Please enter an integer between 1 and 100000 : 1

End with which positive integer ?

Please enter an integer between 1 and 100000 : 30

Int Classifications................................... .

-----------------------------------------------------------------------

1 Odd Prime Deficient Square Triangular

2 Even Prime Deficient

3 Odd Prime Deficient Triangular

4 Even Composite Deficient Square

5 Odd Prime Deficient

6 Even Composite Perfect Triangular

7 Odd Prime Deficient

8 Even Composite Deficient

9 Odd Composite Deficient Square

10 Even Composite Deficient Triangular

11 Odd Prime Deficient

12 Even Composite Abundant

13 Odd Prime Deficient

14 Even Composite Deficient

15 Odd Composite Deficient Triangular

16 Even Composite Deficient Square

17 Odd Prime Deficient

18 Even Composite Abundant

19 Odd Prime Deficient

20 Even Composite Abundant

21 Odd Composite Deficient Triangular

22 Even Composite Deficient

23 Odd Prime Deficient

24 Even Composite Abundant

25 Odd Composite Deficient Square

26 Even Composite Deficient

27 Odd Composite Deficient

28 Even Composite Perfect Triangular

29 Odd Prime Deficient

30 Even Composite Abundant

Between 1 and 30 there were

15 Odd integers and 15 Even integers

11 Prime numbers and 19 Composite numbers

2 Perfect, 5 Abundant and 23 Deficient numbers

5 Squares

7 Triangular numbers

Although your output need not be identical to the above, all information (including the greeting) must be present.