What does double mean in java

Double in Java is a double-precision floating-point primitive type with 64-bit precision. It can represent a numerical range from -1.7976931348623157E308 to 1.7976931348623157E308. It occupies 8 bytes of storage space and is often used for high-precision calculations. , need to pay attention to the errors and rounding problems of floating point number comparison.

##Double in Java

In Java,

double is a primitive type, Used to represent double-precision floating point numbers. It can represent a wider range of numbers and higher precision than the float type.

Features

• Precision: double has a precision of 64 bits and can represent more significant digits than the float type.
• Range: It can represent the range of numbers from -1.7976931348623157E308 to 1.7976931348623157E308.
• Storage space: Double type variables occupy 8 bytes of storage space.

Usage scenarios

The double type is usually used to store values ​​that require high precision and wide range, such as:

Science Calculation
• Financial Calculation
• Engineering Simulation

Notes

• Comparison:Due to the limited precision of floating point numbers, using == or != to compare double values ​​may lead to inaccurate comparison results. It is recommended to use Math.abs(a - b) < epsilon for comparison.
• Rounding: Rounding errors may occur when converting double values ​​to other data types.

Example

<code class="java">double salary = 1000.50;
double pi = 3.14159265358979323846;
double scientificNumber = 1.234567890123456789E10;</code>

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