All basic knowledge of c language

The basics of C language include: data type (integral, floating point, character, string) variable declaration and initialization operator (arithm, comparison, assignment) control flow (conditional statements, loop statements, jump statements) function (definition and call) pointer (declaration and access value to) array (declaration and access elements) string (character array and related functions) other foundations (preprocessor, input/output, comment)

Basics of C Language

C is a computer programming language known for its efficiency, simplicity and portability, and is widely used in operating systems, compilers and embedded systems. The following introduces the basics of C language:

Data Type

• Integer: Store integers such as int , long , short
• Float type: store floating point numbers, such as float , double
• Character type: Stores a single character, such as char
• String type: store character array, such as char[]

variable

• Declare variables: Use data_type variable_name; syntax
• Initialize variable: Assign value to variable, such as int x = 5;

Operators

• Arithmetic operators: -, *, /, %
• Comparison operators: ==, !=, >, =,
• Assignment operator:=

Control flow

• Conditional statements: if , else if , else
• Loop statement: for , while , do-while
• Jump statement: break , continue

function

• Define function: data_type function_name(parameter_list) { ... }
• Call function: function_name(arguments);

pointer

• Declare pointer: data_type* pointer_name;
• Access the value pointed to by the pointer: *pointer_name

Array

• Declare array: data_type array_name[size];
• Access array elements: array_name[index]

String

• Character array: a sequence of characters ending with '\0'
• String functions: strlen , strcpy , strcmp

Other basic knowledge

• Preprocessor: #include , #define
• Input/output: printf , scanf
• Comments: // Line Comments, /* ... */ Block Comments

Mastering these basic knowledge is very important for understanding and writing C language programs. You can find more detailed information and code examples online or in books.

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