Which Types of Data Can a Case Structure Use as a Selector?

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Angela Bailey

When working with case structures in programming, it’s important to understand the types of data that can be used as selectors. A case structure allows you to perform different actions based on the value of a selector. The selector is typically a variable or an expression that determines which branch of code to execute.

Simple Data Types

The simplest and most commonly used data types for case selectors are numeric and string. Numeric selectors can be integers or floating-point numbers, while string selectors are sequences of characters enclosed in quotes. For example:

Case
   1: Execute code block 1
   2: Execute code block 2
   ..
End Case

In this example, the case structure uses numeric selectors starting from 1. Depending on the value of the selector variable, the corresponding code block will be executed.

Case
   "Red": Execute code block 1
   "Green": Execute code block 2
   .
End Case

In this case, string selectors like “Red” and “Green” are used. The code blocks will be executed based on the value of the string selector.

Enumerated Data Types

An enumerated data type, also known as an enum, is a user-defined data type that consists of a set of named values called elements. Enumerations provide a way to define a list of possible values for a variable.

enum Color { Red, Green, Blue };

Case (Color)
   Red: Execute code block 1
   Green: Execute code block 2
   .
End Case

In this example, the case structure uses an enum called Color. The code blocks will be executed based on the value of the Color variable.

Boolean Data Type

The boolean data type is a data type that can have one of two states: true or false. It is commonly used in programming to represent logical values.

Case (Boolean)
   true: Execute code block 1
   false: Execute code block 2
End Case

In this case, the code blocks will be executed based on the value of a boolean variable.

Custom Data Types

In addition to the built-in data types, you can also use custom data types as selectors in a case structure. Custom data types are defined by the programmer and can be composed of multiple simple or complex data types.

struct Person {
   string name;
   int age;
};

Case (Person)
   Person1: Execute code block 1
   Person2: Execute code block 2
End Case

In this example, the case structure uses a custom data type called Person. Depending on the value of the Person variable, different code blocks will be executed.

In conclusion,

A case structure can use various types of data as selectors, including simple data types like numeric and string, enumerated data types, boolean data type, and even custom data types. By understanding these different options, you can create more flexible and robust programs that respond to different conditions and scenarios.

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