objective-c编程第2版=objective-c program 2nd edition_13889311下载

weixin_39820535 2020-06-19 03:00:22

objective-c编程第2版=objective-c program 2nd edition_13889311
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objective-c编程第2版=objective-c program 2nd edition_13889311 objective-c编程第2版=objective-c program 2nd edition_13889311

C and Objective-C When you run a program, a file is copied from the file system into memory (RAM), and the instructions in that file are executed by your computer. Those instructions are inscrutable to humans. So, humans write computer programs in a programming language. The very lowest-level programming language is called ! . In assembly code, you describe every step that the CPU (the computer’s brain) must take. This code is then transformed into (the computer’s native tongue) by an . Assembly language is tediously long-winded and CPU-dependent (because the brain of your new iMac can be quite different from the brain of your well-loved, well-worn PowerBook). In other words, if you want to run the program on a different type of computer, you will need to rewrite the assembly code. To make code that could be easily moved from one type of computer to another, we developed “high- level languages.” With high-level languages, instead of having to think about a particular CPU, you can express the instructions in a general way, and a program (called a " ) will transform that code into highly-optimized, CPU-specific machine code. One of these high-level languages is C. C programmers write code in the C language, and a C compiler converts the C code into machine code.

• Objects ○ An object is similar to a struct, it can contain several pieces of related data. In a struct, we called them member. In an object, we call them instance variables.(or ivars)

Init You send the init message to the new instance so that it can initialize its instance variables to usable values; alloc creates the space for an object, and init makes the object ready to wo

Variables and Types short , int , long float , double Char pointer A pointer holds a memory address.It is declared using the asterisk character. For example,a variable declared as int * ca

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