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The computer scientists Dennis Ritchie and Brian Kernighan developed C at Bell Laboratories in 1978
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You must know at least some C if you want to program using Objective-C In this chapter, you review basic C This chapter assumes some programming experience for instance, I assume you know what a method, an integer, a function, and other basic programming constructs are Ideally, you have had at least one university course using Java or an year s experience using Java Experience using C# also suffices, as the language is remarkably similar to Java
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C Command-Line Programs
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Like Java, C programs start with a main method The C main method takes an integer and a pointer to a character array as inputs and returns an integer
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int main (int argc, const char * argv[])
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The returned integer typically indicates the program s success or failure Zero usually indicates success, while a number indicates failure Often programmers return different values as error codes Program users can then determine what went wrong by looking up the error code in the application s documentation
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Main can only be implemented once in your program When your program runs, OS X finds the main method and uses it as your program s starting point
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Try This
Creating a Simple C Program Using Xcode
1 Open Xcode, and create a new project Select Command Line Utility | Standard Tool, and
click the Choose button Name the project C Main Project (Figure 2-1)
2 Open mainc and note the method created by Xcode It even created the Hello World
message for you (Listing 2-1) Click Build And Go, and review the Debugger Console s logging Listing 2-1 The main method in a C program
#include <stdioh> int main (int argc, const char * argv[]) { // insert code here printf("Hello, World!\n"); return 0; }
Figure 2-1
Xcode New Project dialog
iPhone SDK Programming: A Beginner s Guide
C Comments
C s comment syntax is the same as Java s A double forward slash indicates everything following on the same line is a comment A slash followed by an asterisk indicates everything following until the next asterisk and slash is a comment For instance, the following are both comments The first is a single-line comment, while the second is a multiline comment
// This is a comment in C code /* This is a multiline comment in C Code This comment can be multiple lines */
Comments are, of course, ignored by the compiler, and are ways for you to provide code explanation for future programmers who might debug or modify your code
Understanding Headers, Import, and Include
A header file ends with an h file extension and contains method prototypes and preprocessing statements A prototype is a function s signature A signature is a method name, return type, and parameters, with no body Compilers use prototypes so methods in other files can see the function You can also say a header file declares methods Declaring a method means you are telling the compiler you intend to define a method with the same signature as the declaration Code including or importing a header file declares to a compiler it might use that header file s functions Through the compiler s magic, the compiler combines all files and resolves references to methods in different files; provided they all play fair and include or import the needed header files
In standard C programs, you usually see headers included in other files You use the #include directive when including a file in another file In Objective-C, you typically see headers imported in other files You use the #import directive when importing a file in another file When importing a header file, the compiler ensures the header is only included once in your application When including a file, no such protection is provided Don t worry if you don t really understand the difference understanding the difference is not important Just know that when iPhone or Mac OS X programming, use import
Try This
Creating a Header File
1 Create a view-based iPhone application using the View-based Application template Name
the application CreateHeaderFile
2 In Groups & Files, create a new folder named c_code Add a C file to the folder using the
New File dialog (Figure 2-2) Be certain the Also Create cworkh check box is selected, name the file cworkc, and add it to the project
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