What Is Casting in Data Structure?


Angela Bailey

Casting is a fundamental concept in data structures that allows us to convert one data type into another. It plays a crucial role in programming languages, enabling us to perform various operations and manipulations on data.

What is Casting?

Casting, also known as type conversion, is the process of converting a value from one data type to another. In the context of data structures, casting allows us to change the interpretation or representation of a particular value.

Why do we need Casting?

There are several scenarios where casting becomes necessary. One common use case is when we want to perform operations involving different data types. For example, adding an integer and a float requires casting one of them into the other’s data type.

Another important reason for casting is when dealing with inheritance in object-oriented programming. When we have a superclass and subclasses inheriting from it, we can cast objects from subclasses to the superclass or vice versa. This allows us to treat different objects uniformly and access common properties and methods defined in the superclass.

Types of Casting:

In most programming languages, there are two types of casting: explicit casting (also known as narrowing or downcasting) and implicit casting (also known as widening or upcasting).

Explicit Casting:

Explicit casting involves converting a value of a larger range data type into a smaller range data type. This operation requires explicit declaration using syntax provided by the programming language. The purpose of explicit casting is to ensure that no information loss occurs during conversion.

For example, let’s say we have an integer variable called num with a value of 10. If we explicitly cast it into a byte variable using (byte)num, the value will be truncated to fit within the byte’s range (-128 to 127). So, after explicit casting, num will be equal to 10 modulo 256 (since it wraps around within the byte’s range).

Implicit Casting:

Implicit casting, on the other hand, is a type of casting where the conversion happens automatically by the programming language itself. It involves converting a value of a smaller range data type into a larger range data type. Implicit casting is considered safe as it does not lead to any information loss.

For example, if we assign an integer value to a float variable, the programming language will automatically convert it to float without any explicit declaration. This is because the float data type can accommodate larger values than an integer.

Common Casting Examples:

  • Casting between numeric data types: We can cast values between integers, floats, doubles, and other numeric data types.
  • Casting between characters and integers: We can convert characters to their corresponding ASCII values and vice versa.
  • Casting between objects: In object-oriented programming languages, we can cast objects between related classes using inheritance.


Casting is an essential concept in data structures that allows us to manipulate and work with different data types effectively. It enables us to perform operations involving different data types and handle inheritance in object-oriented programming. Understanding the different types of casting (explicit and implicit) and their use cases is crucial for writing robust and efficient code.

Remember to use casting judiciously to avoid potential runtime errors or information loss. With proper understanding and usage of casting, you can harness its power to create flexible and dynamic programs.

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