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Objective-C Programming The Big Nerd Ranch Guide 2nd Edition

2017-11-12 上传大小:16.38MB
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 t
o 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.
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