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# Struct & Enum in C#

### C# Structs

In C#, classes and structs are blueprints that are used to create instance of a class. Structs are used for lightweight objects such as Color, Rectangle, Point etc.

Unlike class, structs in C# are value type than reference type. It is useful if you have data that is not intended to be modified after creation of struct.

Let’s see a simple example of struct Rectangle which has two data members width and height.

```using System;
public struct Rectangle  {
public int width, height;

}
public class TestStructs  {
public static void Main()  {
Rectangle r = new Rectangle();
r.width = 4;
r.height = 5;
Console.WriteLine("Area of Rectangle is: " + (r.width * r.height));
}
}
```

Output:

```Area of Rectangle is: 20
```

### C# Enum

Enum in C# is also known as enumeration. It is used to store a set of named constants such as season, days, month, size etc. The enum constants are also known as enumerators. Enum in C# can be declared within or outside class and structs.

Enum constants has default values which starts from 0 and incremented to one by one. But we can change the default value.

Points to remember:

• enum has fixed set of constants
• enum improves type safety
• enum can be traversed

Let’s see a simple example of C# enum.

```using System;
public class EnumExample  {
public enum Season { WINTER, SPRING, SUMMER, FALL }

public static void Main()  {
int x = (int)Season.WINTER;
int y = (int)Season.SUMMER;
Console.WriteLine("WINTER = {0}", x);
Console.WriteLine("SUMMER = {0}", y);
}
}
```

Output:

```WINTER = 0
SUMMER = 2
```

We can also change the starting index, see the below code.

`public enum Season { WINTER=10, SPRING, SUMMER, FALL }    `

In order to traverse all values we can use getNames() or getValues() methods.

```using System;
public class EnumExample  {
public enum Days { Sun, Mon, Tue, Wed, Thu, Fri, Sat };

public static void Main()  {
foreach (string s in Enum.GetNames(typeof(Days)))  {
Console.WriteLine(s);
}
}
}  ```

Output:

```Sun
Mon
Tue
Wed
Thu
Fri
Sat
```

Try the following example in the editor below.

Create a structure named ‘`student`’, containing three members: name (string), rollno(int) and marks(int).

Hints
• Complete Solution

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