Enumeration in C

[Kalyan]

Enumeration in C

An enum type declaration defines a type name for a related group of symbolic constants. Enums are typically used when for
"multiple choice" scenarios, in which a runtime decision is made from a number of options that are known at compile-time.

The example

Code Select Expand


enum Color {
Red,
Blue,
Green
}

class Shape
{
public void Fill(Color color) {
switch(color) {
case Color.Red:
...
break;

case Color.Blue:
...
break;

case Color.Green:
...
break;

default:
break;
}
}
}

shows a Color enum and a method that uses this enum. The signature of the Fill method makes it clear that the shape can be
filled with one of the given colors.

The use of enums is superior to the use of integer constants – as is common in languages without enums – because the use of
enums makes the code more readable and self-documenting. The self-documenting nature of the code also makes it possible
for the development tool to assist with code writing and other "designer" activities. For example, the use of Color rather than
int for a parameter type enables smart code editors to suggest Color values.