Example 1 - BrainyNumber

toString

This is the standard toString method. Very helpful for debugging and more.

We can code it just like shown here.

We should add toString to all classes we code.

public String toString() {
	return String.format("BrainyNumber(%d)", this.myNumber);
}

getMyNumber

Returns the value of the ivar named "myNumber". This simple method is called a "getter" because it gets the ivar.

//Example Usage

BrainyNumber bn = new BrainyNumber(11);
prn("BrainyNumber is: " + bn.getMyNumber());
//Output should be:
// BrainyNumber is: 11

isGreaterThan

Returns true if our number is greater than the passed method parameter (an int).

//Example Usage

BrainyNumber bn = new BrainyNumber(12);
prn("Is BrainyNumber greater than 5: " + bn.isGreaterThan(5));
//Output should report true

tripled

Returns our number tripled. Return type is int.

BrainyNumber bn = new BrainyNumber(6);
prn("tripled -- 6: " + bn.tripled());
//tripled -- 6: 18

isEasilyDivisible

Returns true if this number is easily divisible.
We define "easily divisible" as divisible by any factor between 2 and 7 */

//Example Usage

BrainyNumber bn = new BrainyNumber(15);
prn("EasilyDivisible -- 15: " + bn.isEasilyDivisible());
//EasilyDivisible -- 15: true
bn = new BrainyNumber(11);
prn("EasilyDivisible -- 11: " + bn.isEasilyDivisible());
//EasilyDivisible -- 11: true

abcFactor

Returns the abcFactor of myNumber

We compute an abcFactor as follows (in order):

Initialize abcFactor to 2 if we are greater than 2, else initialize abcFactor to 1
If we are greater than 10, then increment abcFactor by 10
If we are greater than 100, then increment abcFactor by 100
If our power to the exponent 3 is greater than 30, increment abcFactor by 30
If we are easily divisible, decrement abcFactor by 50
If abcFactor is negative,
set abcFactor to -abcFactor (i.e., invert abcFactor)
Return abcFactor

Example:
	What is the abcFactor of the number 15?
Answer:
	abcFactor is 8 (using the given computation steps)
Example:
	What is the abcFactor of the number 1?
Answer:
	abcFactor is 1 (using the given computation steps)

power

This method receives one param which is the exponent to power this number by.

Return the power of my number to the param (exponent).

The exponent is an abbreviation for repeated multiply.

Example:
	base (my number) = 2
	exponent (param) = 5
Answer
	power = 2 * 2 * 2 * 2 * 2 = 32

allSmallerSum

Return sum of all positive numbers less than me (my number)

Example:
	my number = 5
Answer
	sum = 1 + 2 + 3 + 4 = 10;