C language 01

1. The C language was invented in 1972 and was first used to rewrite the UNIX operating system (Unix was previously written with sinks), and the C language was greatly expanded with the success of UNIX. C language is a process-oriented language, non-object-oriented, objective-c and C + + are object-oriented.

2. C language Features: Rich operator (34 kinds), rich data type (integer int, float float, char char, array type int[], pointer type void*, struct type struct, common body type Union, note no Boolean type), Allows direct access to the physical location and operation of the hardware. There are high-level language functions, and assembly language bite, Bytes and addresses to operate, and these three are the most basic computer work unit, high efficiency and portability good.

3. The use of C language: has a strong data processing capabilities, and allows direct access to the physical address, directly to the hardware operation, so it is suitable for writing system software, graphics processing, microcontroller programs, embedded system development. Android's underlying system is written in C language.

The core of iOS development is the addition of a layer of object-oriented syntax based on the C language, Objective-c,oc.

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C language 01