What is typedef enum?
The typedef keyword allows us to rename a data type to a name that has more meaning to our program. The typedef statement may be specified by itself or as part of a enum or struct definition. The typedef defined new name is often the given the same name as the enum or struct definition.
What is the sizeof enum?
On an 8-bit processor, enums can be 16-bits wide. On a 32-bit processor they can be 32-bits wide or more or less. The GCC C compiler will allocate enough memory for an enum to hold any of the values that you have declared. So, if your code only uses values below 256, your enum should be 8 bits wide.
What is enum declaration?
An enumeration consists of a set of named integer constants. An enumeration type declaration gives the name of the (optional) enumeration tag. And, it defines the set of named integer identifiers (called the enumeration set, enumerator constants, enumerators, or members).
What is extensible enum?
Enumextension object Enums can be extended in order to add more values to the enumeration list in which case the Extensible property must be set to true . The syntax for an enum extension, which extends the Loyalty enum with the value Diamond, is shown below.
What is the difference between typedef and enum?
Note: Using typedef is not common in C++, because enum defines a type name automatically. The construct is more common in C, where enum without typedef must be used only as a tag, i.e. with enum keyword.
Why is enum size 4?
An enum is only guaranteed to be large enough to hold int values. The compiler is free to choose the actual type used based on the enumeration constants defined so it can choose a smaller type if it can represent the values you define.
How is enum stored in memory?
As enum types are handled as integral types, they are stored in the stack and registers as their respective data types: a standard enum is usually implemented as an int32; this means that the compiler will handle your enum as a synonym of int32 (for the sake of simplicity, I left out several details).
Can enum class have methods?
The enum class body can include methods and other fields. The compiler automatically adds some special methods when it creates an enum. For example, they have a static values method that returns an array containing all of the values of the enum in the order they are declared.
Why is enum used in C?
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++. Following is an example of enum declaration.
Can an enum extend an enum?
No, we cannot extend an enum in Java. Java enums can extend java. lang. Enum class implicitly, so enum types cannot extend another class.