Basic grammatical points in C language

The history of computer language:

Machine Language ----> Assembly Language ----> Advanced Language (1. for process 2. Object Oriented )

any one C The program is composed of one or more program segments, each of which has its own energy, we generally call these program segments as functions . So the C Language program has a function.

Compile: put C language code translated into 0 and the 1 , it will only detect if the syntax is incorrect and will not detect Main whether the function exists

Tools:clang compiler clang compiler needs to install command line tools

directive: cc–c file name . C

The compilation succeeds and an . o file is generated

Links: is actually to take our . O object file with the system's own library of functions, generate an executable file, detect Main whether the function exists

connector

directive:CC file name . O

4. run: ./a.out

Unix directive:

2. 1. ls-l

4. 2. pwd

6. 3. –o Change file name

8. 4. Touch Create a file

Key Words also called reserved words, altogether + keywords, the keywords are lowercase

Identifiers : Some symbols and names that are customized in the program. For example: the name of the function

Data:

Classification of data: static data, Dynamic Data (temporary data)

The static data is stored on the hard disk, the dynamic Data occupies the memory space

C data types in languages: basic data types, pointer types, constructed types, empty types

Scanf

Memory addressing is large to small, priority allocating memory addresses larger bytes to variables

Output Address %p

Scanf The function only accepts the address of the variable, it is a blocking function, waiting for the user input, after the user input, the user input value will be assigned to the variable

This article is from the "I am the way of it Growth" blog, please be sure to keep this source http://jeason.blog.51cto.com/9704473/1596290

Basic grammatical points in C language