What Data Type Is Double?


Angela Bailey

When it comes to programming, data types play a crucial role in defining the characteristics and behavior of variables. One such data type is the double. In this article, we will explore what exactly the double data type is and how it is used in programming.

What Is the Double Data Type?

The double data type, also known as double precision floating-point, is a numeric data type that can store decimal numbers with a higher degree of precision compared to its counterpart, the float data type. It occupies 8 bytes (64 bits) of memory and can represent values ranging from approximately ±5.0 × 10-324 to ±1.7 × 10308.

Usage in Programming

The double data type is commonly used when high precision is required, such as in scientific calculations or financial applications. It allows for more accurate representation of fractional values and provides a wider range of possible values compared to other numeric data types.

Declaring a Double Variable

In most programming languages, declaring a variable as a double is straightforward. Here’s an example:

double pi = 3.14159;

In this example, we declare a variable named pi and assign it the value of 3.14159.

Performing Operations with Doubles

The arithmetic operations that can be performed on doubles are similar to those for other numeric data types. You can add (+), subtract (-), multiply (*), or divide (/) doubles just like any other numbers.

double result = pi * 2;

In this example, we multiply the value of pi by 2 and store the result in a variable named result.

Converting Doubles

Sometimes, it may be necessary to convert a double to another data type. This can be done using type casting or conversion functions provided by the programming language.

int intValue = (int)pi;

In this example, we convert the value of pi from a double to an integer and store it in a variable named intValue. Note that this conversion may result in loss of precision, as decimals are truncated.


In conclusion, the double data type is a valuable tool for working with decimal numbers that require high precision. It offers a wider range of values compared to other numeric data types and is commonly used in scientific and financial applications. Understanding how to declare, perform operations on, and convert doubles is essential for any programmer.

Further Reading

I hope this article has provided you with a comprehensive understanding of the double data type and its usage in programming. Remember to always consider your specific requirements when choosing the appropriate data type for your variables.

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