constant definition

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Introduction to conversion between data types in PHP learning

Copy CodeThe code is as follows: /* data types are converted to each other * One is a cast * SETTYPE (variable, type); Int,integer,float,double and so on. * This function changes the type of the original variable, with Var_dump (), you can view the

Introduction to the use of Enum types in the Java language

An introduction to the type of Enum The enumeration type (enumerated type) appears early in the programming language and is used to include a similar set of values into one type. The name of this enumeration type is defined as a unique type

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