If a default argument is provided in the parameter list of a function definition, the default argument is available only for function calls in the source file that contains the function definition.

如果在函数定义的形参表中提供默认实参，那么只有在包含该函数定义的源文件中调用该函数时，默认实参才是有效的。

youdao

If a default argument is provided in the parameter list of a function definition, the default argument is available only for function calls in the source file that contains the function definition.

如果在函数定义的形参表中提供默认实参，那么只有在包含该函数定义的源文件中调用该函数时，默认实参才是有效的。

youdao