Programming in Objective-C (6th Edition) (Developer's Library)
Stephen G. Kochan
Format: PDF / Kindle (mobi) / ePub
Updated for OS X 10.9 Mavericks, iOS 7, and Xcode 5
Programming in Objective-C is a concise, carefully written tutorial on the basics of Objective-C and object-oriented programming for Apple's iOS and OS X platforms.
The book makes no assumptions about prior experience with object-oriented programming languages or with the C language (which Objective-C is based upon). Because of this, both beginners and experienced programmers alike can use this book to quickly and effectively learn the fundamentals of Objective-C. Readers can also learn the concepts of object-oriented programming without having to first learn all of the intricacies of the underlying C programming language.
This unique approach to learning, combined with many small program examples and exercises at the end of each chapter, makes Programming in Objective-C ideally suited for either classroom use or self-study.
This edition has been fully updated to incorporate new Objective-C features and technologies introduced with Xcode 5, iOS 7, and Mac OS X Mavericks.
“The best book on any programming language that I’ve ever read. If you want to learn Objective-C, buy it.”—Calvin Wolcott
“An excellent resource for a new programmer who wants to learn Objective-C as their first programming language—a woefully underserved market.”—Pat Hughes
of a long variable depends on your particular computer system. To display the value of a long int using NSLog, the letter l is used as a modifier before the integer format characters.This means that the format characters %li can be used to display the value of a long int in decimal format. You can also have a long long int variable, or even a long double variable to hold a floating point number with greater range. The qualifier short, when placed in front of the int declaration, tells the
It introduces a new (and rather unique) operator in the Objective-C programming language: the increment operator. The function of the double plus sign, or the increment operator, is to add 1 to its operand.Addition by 1 is such a common operation in programs that a special operator was created solely for this purpose.Therefore, the expression ++n is equivalent to the expression n = n + 1.At first glance, it might appear that n = n + 1 is more readable, but you will soon get used to the function
(If it is already positive, you don’t want to negate it.) The absolute value of number is then displayed by the program, and program execution ends. Let’s look at another program that uses the if statement.We’ll add one more method to the Fraction class, called convertToNum.This method will provide the value of a fraction expressed as a real number. In other words, it will divide the numerator by the denominator and return the result as a double precision value. So if you have the fraction 1/2,
value is not equal to zero, no integer was found that evenly divided p; therefore, p must be a prime number, and its value is displayed. You might have noticed that the variable isPrime takes on either 0 or 1, and no other values. Its value is 1 as long as p still qualifies as a prime number. But as soon as a single even divisor is found, its value is set to 0 to indicate that p no longer satisfies the criteria for being prime.Variables used in such a manner are generally referred to as Boolean
your project Xcode creates files for the new class In the file Fraction.h, you will now enter your interface section for the Fraction class, as shown in Program 7.1. Program 7.1 // // // // Interface File Fraction.h Fraction.h FractionTest www.it-ebooks.info 129 130 Chapter 7 More on Classes // // // Created by Steve Kochan on 9/29/11. Copyright (c) ClassroomM, Inc. All rights reserved. #import