c language const usage

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const is a keyword that can be used to declare constants, const modifiers in function parameters, const modified function return values, and const modified pointers. Detailed introduction: 1. Declare constants. The const keyword can be used to declare constants. The value of the constant cannot be modified during the running of the program. The constant can be a basic data type, such as integer, floating point number, character, etc., or a custom data type; 2. The const modifier in the function parameters. The const keyword can be used in the parameters of the function, indicating that the parameter cannot be modified inside the function, etc.