How do you define symbolic constants in the C language?

In the C language, symbol constants can be defined using the #define preprocessor directive. The general syntax format for defining symbol constants is:

#define 常量名 常量值

For example, define an integer constant MAX_NUM with a value of 100.

#define MAX_NUM 100

When using this constant in the program, just use MAX_NUM directly. For example:

int num = MAX_NUM;

In this way, the value of num is assigned as 100. The advantage of using symbolic constants is that it can enhance the readability and maintainability of the code. Additionally, the value of symbolic constants is determined at the time of program compilation and cannot be changed.