CISC 3115 — Lab #3

Lab 3.1.1 An Immutable Integer Class (`ImmutableInt`) (Approval)

Write an immutable class, Immutable, modelling integers, with the following state/behavior:

Methods:
- ImmutableInt add(ImmutableInt immutableInt)
- ImmutableInt sub(ImmutableInt immutableInt)
- ImmutableInt mul(ImmutableInt immutableInt)
- ImmutableInt div(ImmutableInt immutableInt)
- toString()
State:
- An int instance variable maintaining the integer value of the object

Have an overloaded, 0-argument constructor that assigns 0 to the internal state variable. This constructor should leverage the 1-argument constructor *i.e., use the this(…) construct)
You can see the output below of the corresponding app class.
Assume 0 is never sent as the argument to div
The app consists of various declarations and creations of the objects, and calls to the methods; e.g.:
```
…
ImmutableInt i1 = new ImmutableInt(10);
System.out.println("i1: " + i1);
…
System.out.println("i1.add(i2): " + i1.add(i2);
…
		
```
- Part of the challenge (i.e., 'fun') here is trying to reproduce my app (i.e., the declaration and creation of the reference variables and objects, and the various calls to the methods of the class. Please feel free to query me if you are having trouble doing so … I will be happy to give you hints

stdout

i1: 10
i2: 20
i3: 0

i1.add(i2): 30
i1.sub(i2): -10
i1.mul(i2): 200
i1.div(i2): 0

i1: 10
i2: 20
i3: 0

Lab 3.1.2 An App Class for 3.1.1 (`ImmutableIntApp`) (Approval)

Write the app class for lab 3.1.1/ The output should match the output as shown in that exercise.

Lab 3.2.1 A Mutable Integer Class (`MutableInt`) (Approval)

Write a Mutable class, MutableInt, modelling integers,with the following state/behavior:

Methods:
- MutableInt increaseBy(MutableInt immutableInt)
- MutableInt decreaseBy(MutableInt immutableInt)
- MutableInt multiplyBy(MutableInt immutableInt)
- MutableInt divideBy(MutableInt immutableInt)
- MutableInt reset()
- toString()
State:
- An int instance variable maintaining the integer value of the object

Have an overloaded, 0-argument constructor that assigns 0 to the internal state variable. This constructor should leverage the 1-argument constructor *i.e., use the this(…) construct)
reset sets the internal state variable to 0
Again, the output of the corresponding app class is shown below.
Assume 0 is never sent as the argument to divideBy
The semantics of the method should be that the receiver is returned as the value of the method, allowing for operation chaining
As in the previous exercise, The app consists of various declarations and creations of the objects, and calls to the methods; e.g.:
```
…
MutableInt i0 = new MutableInt();
System.out.println("i0: " + i0);
…
System.out.println("i0.increaseBy(i1): " + i0.increaseBy(i1);
…
		
```
- Again, part of the challenge (i.e., 'fun') here is trying to reproduce my app (i.e., the declaration and creation of the reference variables and objects, and the various calls to the methods of the class. Please feel free to query me if you are having trouble doing so … I will be happy to give you hints
  - I'm guessing this one is a bit more 'challenging'' then the previous, but once you get here, you'll have the experience of the first one, which should be a help.

stdout

===== Initial Values =====
i0: 0
i1: 10
i2: 5
i3: 20
i4: 25

i0.increaseBy(i1): 10
i0: 10
i1: 10
i2: 5
i3: 20
i4: 25

i0.decreaseBy(i2): 5
i0: 5
i1: 10
i2: 5
i3: 20
i4: 25

i0.multiplyBy(i3): 100
i0: 100
i1: 10
i2: 5
i3: 20
i4: 25

i0.divideBy(i4): 4
i0: 4
i1: 10
i2: 5
i3: 20
i4: 25

i0.reset(): 0
i0: 0

===== Chaining =====

i0.increaseBy(i1).decreaseBy(i2).multiplyBy(i3).divideBy(i4): 4
i0: 4
i1: 10
i2: 5
i3: 20
i4: 25

Lab 3.2.2 An App Class for 3.2.1 (`ImmutableIntApp`) (Approval)

Write the app class for lab 3.1.1/ The output should match the output as shown in that exercise.

CISC 3115
Introduction to Modern Programming Techniques
Lab #03
Classes

How to Develop and Submit your Labs

Overview

Lab 3.1 Immutable Integer

Lab 3.1.1 An Immutable Integer Class (`ImmutableInt`) (Approval)

Lab 3.1.2 An App Class for 3.1.1 (`ImmutableIntApp`) (Approval)

Lab 3.2 Mutable Integer

Lab 3.2.1 A Mutable Integer Class (`MutableInt`) (Approval)

Lab 3.2.2 An App Class for 3.2.1 (`ImmutableIntApp`) (Approval)

CISC 3115 Introduction to Modern Programming Techniques Lab #03 Classes

How to Develop and Submit your Labs

Overview

Lab 3.1 Immutable Integer

Lab 3.1.1 An Immutable Integer Class (ImmutableInt) (Approval)

Lab 3.1.2 An App Class for 3.1.1 (ImmutableIntApp) (Approval)

Lab 3.2 Mutable Integer

Lab 3.2.1 A Mutable Integer Class (MutableInt) (Approval)

Lab 3.2.2 An App Class for 3.2.1 (ImmutableIntApp) (Approval)

CISC 3115
Introduction to Modern Programming Techniques
Lab #03
Classes

Lab 3.1.1 An Immutable Integer Class (`ImmutableInt`) (Approval)

Lab 3.1.2 An App Class for 3.1.1 (`ImmutableIntApp`) (Approval)

Lab 3.2.1 A Mutable Integer Class (`MutableInt`) (Approval)

Lab 3.2.2 An App Class for 3.2.1 (`ImmutableIntApp`) (Approval)