Objective-C Programming: The Big Nerd Ranch Guide (Big Nerd by Aaron Hillegass

By Aaron Hillegass

are looking to write purposes for iOS or the Mac? This advent to programming and the Objective-C language is step one in your trip from somebody who makes use of apps to anyone who writes them.

in response to colossal Nerd Ranch's mythical Objective-C Bootcamp,¿this publication covers C, Objective-C, and the typical programming idioms that allow builders to utilize Apple applied sciences.

this can be the one introductory-level publication written by way of Aaron Hillegass, probably the most skilled and authoritative voices within the iOS and Cocoa group.

appropriate with Xcode 4.2, iOS five, and Mac OS X 10.7 (Lion), this advisor beneficial properties brief chapters and interesting type to maintain you stimulated and relocating ahead. while, Aaron’s decision that you simply comprehend what you’re doing—or at the least why you’re doing it—encourages you to imagine significantly as a programmer.

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Then update main() to call the new function. 0; printf("%f Celsius is %f Fahrenheit\n", cel, fahr); return fahr; } int main(int argc, const char * argv[]) { float freezeInC = 0; float freezeInF = fahrenheitFromCelsius(freezeInC); printf("Water freezes at %f degrees Fahrenheit\n", freezeInF); return 0; } See how we took the return value of fahrenheitFromCelsius() and assigned it to the freezeInF variable of type float? Pretty slick, huh? The execution of a function stops when it returns. 0; printf("The mean justifies the end\n"); } If you called this function, the printf() call would never get executed.

Let’s get started with an exercise that demonstrates what functions are good for. When should I use a function? Suppose you are writing a program to congratulate students for completing a Big Nerd Ranch course. Before worrying about retrieving the student list from a database or about printing certificates on spiffy Big Nerd Ranch paper, you want to experiment with the message that will be printed on the certificates. To do that experiment, create a new project: a C�Command�Line�Tool named ClassCertificates.

The do-while loop doesn’t check the expression until it has executed the block. Thus, it ensures that the block is always executed at least once. If you rewrote the original exercise to use a do-while loop, it would look like this: 53 Chapter 7 Loops int main(int argc, const char * argv[]) { int i = 0; do { printf("%d. Aaron is Cool\n", i); i++; } while (i < 13); return 0; } Notice the trailing semicolon. 5 do-while loop Challenge Write a program that counts backward from 99 through 0 by 3, printing each number.

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