C language stipulates that what determines the type of function return value?

#C language stipulates that the type of function return value is determined by the type defined in the function header. The function return value should be consistent with the type defined in the header. If it is inconsistent, the return value will be automatically converted to the type defined in the function header. If no type is defined, it defaults to int type.

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That is to say, what type is your function and what type is the return value.

For example:

Function definition int fun(int a,char b)

The return value is an integer

Function definition int *fun(int a )

The return value is a pointer whose base type is an integer

Function definition void fun(int a)

No return value

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