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objective-c编程 第2版=objective-c program 2nd edition_13889311下载
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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下载
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objective-c
编程
第2
版
=
objective-c
program
2nd
edit
ion
_
13889311
objective-c
编程
第2
版
=
objective-c
program
2nd
edit
ion
_
13889311
objective-c
编程
第2
版
=
objective-c
program
2nd
edit
ion
_
13889311
Objective-C
Program
ming The Big Nerd Ranch Guide
2nd
Edit
ion
C and
Objective-C
When you run a
program
, a file is copied from the file system into memory (RAM), and the instruct
ion
s in that file are executed by your computer. Those instruct
ion
s are inscrutable to humans. So, humans write computer
program
s in a
program
ming language. The very lowest-level
program
ming 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 instruct
ion
s 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
program
mers write code in the C language, and a C compiler converts the C code into machine code.
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