What does double mean in java

Double in Java is a keyword used to declare double-precision floating-point numbers, with a large range (±(21023-1)x 2-1022 to ±(21023-1)x 21023) and high precision ( 15-17 significant figures) and takes up 8 bytes of storage space. Compared with float, double has a larger range and higher precision, but also has larger storage space.

What is double in Java

In Java programming language, double is A keyword used to declare and use double-precision floating-point types. Double-precision floating point numbers are a data type used to represent numbers with a larger range and precision. They are generally used for scientific calculations or processing high-precision values.

Characteristics of double-precision floating-point numbers

• Range:The range of double-precision floating-point numbers is larger than other floating-point number types. Indicates the range between ±(2¹⁰²³-1) x 2^-1022 to ±(2¹⁰²³-1) x 2¹⁰²³ number.
• Precision: Double-precision floating point numbers have up to 15-17 significant digits, which allows them to represent more precise numbers.
• Storage space: Double-precision floating point numbers occupy 8 bytes of storage space.

Using double

To declare a double type variable, you can use the following syntax:

<code class="java">double variableName;</code>

For example:

<code class="java">double myDouble = 3.14159265358979323846;</code>

<code class="java">double myDouble = 1.234e10; // 科学计数法表示法</code>

Comparison with other floating point types

There are other floating point types in Java, such as float. Compared to double, float has smaller range and precision, but takes up less storage space. The following is a comparison of different floating point types:

##double±(215-17 bits8 bytesfloat±(26-7 bits4 bytes

Floating point type	Range	Precision	Storage space
	1023-1)x 2-1022 to±( 21023-1) x 21023
	127-1)x 2-126 to±(2127-1)x 2128

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