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The default storage category of formal parameters in C language is the auto; formal parameter. When the keyword auto is used to declare the storage category, the keyword "auto" can be omitted, and if auto is not written, it is implicitly defined as "automatic storage category", which belongs to dynamic storage mode.

This article operating environment: Windows7 system, C11, Dell G3 computer.

What is the default storage category for formal parameters in C language?

The default storage category for formal parameters in the C language is auto. When the program is compiled, no storage space is allocated for the formal parameters. Formal parameters temporarily occupy storage space only when called.

When the formal parameter uses the keyword auto to declare the storage category, the keyword "auto" can be omitted, and if auto is not written, it is implicitly determined as "automatic storage category", which belongs to the dynamic storage mode.

Extended data

1. The type of formal parameter can not be omitted. The storage type of the function is the storage type in front of the data type in front of the function name when defining the function. By default, it should be: extern, indicating that the function belongs to an external function (that is, it can be called by functions in other C source program files outside this C file).

2, for custom functions, you can use default parameters to achieve a certain degree of "overloading" and other functions, the default parameters can only be placed in the function declaration, because the compiler must know the default values before use, and the parameters at the back of the function parameter list can be defaulted. After using the default parameter values in a certain location, they are all default parameter values.

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