How to use typedef struct in c language

The typedef keyword is used to create aliases for custom data types, allowing the names of complex structures to be simplified. The usage steps are as follows: create a custom data type (such as a structure); use typedef to give it a new name (alias); use aliases to replace the original data type name to improve code readability, reduce redundancy and ease maintenance.

Usage of typedef struct in C language

typedef Keyword in C language is used to create custom data types, allowing a structure, union, or enumeration to be given a new name. It simplifies code by creating a new type alias, making it easier for users to define and use complex data structures.

Syntax:

<code>typedef <original_type> <alias_name>;</code>

Where:

• <original_type>: The original data type to create the alias .
• <alias_name>: The name to be given to the new type.

Usage:

To use typedef, follow these steps:

1. Create a custom data type:

   <code class="C">struct student {
       int id;
       char name[20];
       float gpa;
   };</code>

2. Use typedef to create an alias:

   <code class="C">typedef struct student Student;</code>

3. Use new alias:
   You can now use Student as an alias for struct student.

<code class="C">Student s1; // 等同于 struct student s1;</code>

Advantages:

• Improve code readability: Using aliases can simplify the name of a complex structure and make it Easier to understand.
• Less redundancy: Avoid duplicating data type names when declaring variables.
• Easy to maintain: If you need to change the data type, you only need to modify the typedef declaration without changing all instances in the code.

Note:

• typedef will not create a new data type, just an alias.
• typedef Must be declared before using the alias.
• Avoid reusing type names already defined in the standard library.

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