What type is double in java?

Double is a primitive data type in Java used to represent double-precision floating point numbers. It has a precision of 15-17 significant digits and has a wider range, representing values ​​from 4.9E-324 to 1.79E 308. It can represent NaN (not a number) and infinity, and is often used in scenarios that require high precision or represent a large range of values, such as scientific computing, financial applications, and physics simulations.

#What type is double in Java?

double is a primitive data type in Java used to represent double-precision floating point numbers. It takes up 8 bytes of memory and can represent a wider range of values, including very large or very small numbers.

Main features:

• Precision: double has a precision of 15-17 significant digits, which is better than float (single-precision floating point number ) has much higher accuracy of 6-7 digits.
• Range: Double has a larger range than float and can represent values ​​from 4.9E-324 to 1.79E 308.
• Represents NaN and infinity: double can represent the special values ​​NaN (not a number) and infinity.

Usage:

double type is usually used in scenarios that require high precision or represent a large range of values, such as:

• Scientific Computing
• Financial Application
• Physical Simulation
• Astronomy

## Syntax:

Declaration double The syntax of the variable is as follows:

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

For example:

<code class="java">double pi = 3.14;</code>

Example:

<code class="java">public class DoubleExample {

    public static void main(String[] args) {
        double distanceToMoon = 384400; // 千米
        double gravityOnJupiter = 24.79; // m/s²
        double pi = Math.PI;

        System.out.println("距离地球到月球的距离：" + distanceToMoon);
        System.out.println("木星上的重力加速度：" + gravityOnJupiter);
        System.out.println("圆周率：" + pi);
    }
}</code>

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