Reference no: EM13899

Question 1

Part 1: Conditional Logic

Conditional logic is used within your application to make decisions during the application lifetime. Objective-C is quite typical of other languages in the syntax and structure of conditional logic, though things get more complicated when attempting to determine if two NSObject-based objects are equal. The main syntax elements you have available are the if statement, the switch statement, and the question mark ? known as the ternary operator in the C programming language.

Create a new project in XCode using the Mac OS X/Command Line Tool template.

Use at least one case of each of the following:

if statement using the == operator
if statement using the is Equal To: method
compound logic, using and (&&) or using or (||)
Perform a logical test to see if something is not true.

Part 2: Methods and Parameters

Methods are functions that are defined on a class in order for that class to perform tasks. Often, those tasks involve ivars and properties of the object, and sometimes those tasks require extra information to complete the task properly. This extra information can be passed to the method through parameters.

Create a new project in XCode using the Mac OS X/Command Line Tool template. You can use the same project as you created in the first part of this assignment. Create a custom class that contains at least three public methods and one private method. From the main() method in main.m, create an instance of the class and demonstrate calling the methods.

At the Apple developer site, track down the official Objective-C documentation. Review the section on properties. The Objective-C Programming Language

Question 2 : Complete all parts

Part 1: A Date class

Design a class called Date. The class should store a date in three integers: month, day, and year. There should be member functions to print the date in the following forms:
12/25/2012
December 25, 2012
25 December 2012

Perform the following input validation: Do not accept values for the day greater than 31 or less than 1. Do not accept values for the month greater than 12 or less than 1.

Part 2: A PayRoll class

Design a PayRoll class that has data members for an employee's hourly pay rate, number of hours worked and total pay for the week. Write a program with an array of seven PayRoll objects. The program should ask the user for the number of hours each employee has worked and will then display the amount of gross pay each has earned.
Perform the following input validation: Do not accept values greater than 60 for the number of hours worked.

Part 3: DayOfYear class

Assuming that a year has 365 days, write a class named DayOfYear that takes an integer representing a day of the year and translates it to a string consisting of the month followed by day of the month. For example,

Day 2 would be January 2
Day 32 would be February 1
Day 365 would be December 31

The initializer for the class should take as parameter an integer representing the day of the year, and the class should have a member function print() that prints the day in the month-day format. Test your class by inputting various integers representing days and printing out their representation in the month-day format.

Demonstrate the functionality of all of these classes in one or more driver programs.