Quick Answer: What Is Enum With Example?

How do I find the description of an enum?

Define an extension method:public static class EnumExtensionMethods.{public static string GetEnumDescription(this Enum enumValue){var fieldInfo = enumValue.

GetType().

var descriptionAttributes = (DescriptionAttribute[])fieldInfo.

return descriptionAttributes.

}More items…•Dec 15, 2014.

Is enum or constant better?

Enums limit you to the required set of inputs whereas even if you use constant strings you still can use other String not part of your logic. This helps you to not make a mistake, to enter something out of the domain, while entering data and also improves the program readability.

What is enum class in C++?

An enumeration is a user-defined type that consists of a set of named integral constants that are known as enumerators. This article covers the ISO Standard C++ Language enum type and the scoped (or strongly-typed) enum class type which is introduced in C++11.

What is the difference between typedef and enum?

A typedef also allows more strict type-checking than just declaring something with, say, “struct mystruct xxx”. An enum declaration allows new names and “values” to be defined and used in the code. In the days when C didn’t have a standard “bool” type, a common enum used to be.

What is enum in Java with example?

The Enum in Java is a data type which contains a fixed set of constants. … The Java enum constants are static and final implicitly. It is available since JDK 1.5. Enums are used to create our own data type like classes. The enum data type (also known as Enumerated Data Type) is used to define an enum in Java.

What is true enum?

The Enum keyword is used to declare an enumeration. By default,the first enumerator has the value 0. An enum can also be nested within a class or struct. Usually it is best to define an enum directly within a namespace so that all classes in the namespace can access it with equal convenience.

What is enum in SQL?

An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time. … The ENUM type has these advantages: Compact data storage in situations where a column has a limited set of possible values.

Why enumeration is used in C++?

Enumeration is a user defined datatype in C/C++ language. It is used to assign names to the integral constants which makes a program easy to read and maintain. The keyword “enum” is used to declare an enumeration. The following is the syntax of enums.

Can we have enum inside enum?

Enum class. … We can also provide various values as enum-member variables with the enum constants. We can create abstract methods within an enum. In that case, all of the Enum constants will become abstract and will be required to implement declared abstract methods.

Can we extend enum in Java?

No, we cannot extend an enum in Java. Java enums can extend java. lang. Enum class implicitly, so enum types cannot extend another class.

How do you define an enum?

An enum is a special “class” that represents a group of constants (unchangeable variables, like final variables). To create an enum , use the enum keyword (instead of class or interface), and separate the constants with a comma.

What is enum used for?

An enum type is a special data type that enables for a variable to be a set of predefined constants. The variable must be equal to one of the values that have been predefined for it. Common examples include compass directions (values of NORTH, SOUTH, EAST, and WEST) and the days of the week.

Is enum int?

You shouldn’t rely on it being either signed or unsigned. According to the standard it is implementation-defined which integral type is used as the underlying type for an enum. In most implementations, though, it is a signed integer.

Are enums are type-safe?

The enums are type-safe means that an enum has its own namespace, we can’t assign any other value other than specified in enum constants. Typesafe enums are introduced in Java 1.5 Version. Additionally, an enum is a reference type, which means that it behaves more like a class or an interface.

What is enum in C with example?

It is used to assign names to the integral constants which makes a program easy to read and maintain. The keyword “enum” is used to declare an enumeration. Here is the syntax of enum in C language, enum enum_name{const1, const2, ……. };

How do you create an enum?

Declaration of enum in java :Enum declaration can be done outside a Class or inside a Class but not inside a Method. … First line inside enum should be list of constants and then other things like methods, variables and constructor.More items…•Dec 10, 2019

Why is enum constructor private?

We need the enum constructor to be private because enums define a finite set of values (SMALL, MEDIUM, LARGE). If the constructor was public, people could potentially create more value. (for example, invalid/undeclared values such as ANYSIZE, YOURSIZE, etc.). Enum in Java contains fixed constant values.

Is enum a data type?

Enumeration (or enum) is a user defined data type in C. It is mainly used to assign names to integral constants, the names make a program easy to read and maintain. … The keyword ‘enum’ is used to declare new enumeration types in C and C++.

Can enum class have methods?

An enum class can include methods and fields just like regular classes. When we create an enum class, the compiler will create instances (objects) of each enum constants. Also, all enum constant is always public static final by default.

What is enum size?

enumRange of Element ValuesEnum Optionssmall (default)int0 .. 327672 bytes unsigned4 bytes signed0 .. 655352 bytes unsigned4 bytes signed-32768 .. 327672 bytes signed4 bytes signed9 more rows

What is enumeration explain with example?

An enumeration is used in any programming language to define a constant set of values. For example, the days of the week can be defined as an enumeration and used anywhere in the program. In C#, the enumeration is defined with the help of the keyword ‘enum’.