Declare an enumeration type

Write the keyword enum, followed by the name of the type, followed by a pair of braces containing a comma-separated list of the enumeration literal names. For example:

enum Season {Spring, Summer, Fall, Winter }

Declare an enumeration variable

Write the name of the enumeration type on the left followed by the name of the variable, followed by a semicolon. For example:

Season
currentSeason;

Initialize or assign an enumeration variable to a value

Write the name of the enumeration literal name in combination with the name of the enumeration type it belongs to. For example:

currentSeason = Season; //  compile time error 
currentSeason = Season.Spring; // okay

Declare a struct type

Write the keyword struct, followed by the name of the struct type, followed by the body of the struct (the constructors, methods, and fields). For example:

struct Time 
{ 
    public Time(int hh, int mm, int ss)  
    { ... } 
    ... 
    private int hours, minutes, seconds; 
}

Declare a struct variable

Write the name of the struct type, followed by the name of the variable, followed by a semicolon. For example:

Time now;

Initialize or assign a struct variable to a value

Initialize or assign the variable to a struct value created by calling a structure constructor. For example:

Time lunch = new Time(12, 30, 0); 
lunch = new Time(12, 30, 0);