C++ Development Note: Avoid Magic Numbers in C++ Code

C development notes: Avoid magic numbers in C code

In C development, magic numbers refer to unexplained hard numbers that appear directly in the code. Encoded numbers. These numbers usually appear multiple times directly in the code, making it difficult to maintain and understand the code. Therefore, it is important to avoid using magic numbers in C development.

Problems with magic numbers
Magic numbers will bring a series of problems to the maintainability and readability of the code. First of all, when the same magic number appears in multiple places, if you need to modify the number, you need to find and replace all related codes one by one, which is error-prone and a waste of time. In addition, magic numbers often lack explanation and meaning, making it difficult for people reading the code to intuitively understand what the numbers do, making it more difficult to understand the code.

Solution
In order to avoid magic numbers appearing in C code, you can adopt the following solutions:

1. Use meaningful naming
   Try to avoid Instead of numbers appearing directly in the text, meaningful names are used to represent the meaning of these numbers. For example, you can use constants or enumeration types to define these numbers, and then reference these constants or enumeration types in the code. This not only gives the numbers clear meanings, but also makes it easy to uniformly manage and modify these values.

For example, define the magic number "365" that appears in the code as a constant named "DAYS_IN_YEAR", so that the meaning of this number can be clearly expressed, and the value can be modified if needed in the future. , you only need to modify the definition of the constant, without modifying all the places where this number is used one by one.

2. Comment Explanation
   If numbers must appear in the code, be sure to add clear comments to these numbers explaining their meaning and purpose. This makes it easier for others to understand the code and reduces the time required for maintenance.
   Example:

   int timeout = 500; // 设置超时时间为500毫秒

   Copy after login
3. Using configuration files
   For some numbers that need to be modified frequently, it is recommended to put these numbers into the configuration file for subsequent modifications. By reading the configuration file, the values ​​of these numbers can be set dynamically without modifying the code. This approach is very practical in software maintenance and configuration management.

Summary
In C development, avoiding magic numbers is a very important development note. By using meaningful naming, adding comment explanations, and using configuration files, you can effectively avoid magic numbers in the code and improve the maintainability and readability of the code. In actual development, we should always pay attention to this and try to avoid the appearance of hard-coded numbers to make the code clearer and easier to understand.

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