How to use double in java

The double data type in Java is used to store double-precision floating point numbers, ranging from -1.7976931348623157E308 to 1.7976931348623157E308, and is used for real number calculations that require high precision, such as monetary values ​​and scientific calculations.

Usage of double in Java

In JavadoubleThe data type is used for storage Double precision floating point number. It is a 64-bit primitive data type that can represent very large or very small real numbers.

Purpose:

• Storage data that requires accuracy greater than float type, such as currency values, scientific calculation results, etc.
• In scenarios involving double-precision mathematical operations, such as trigonometric functions, logarithms, etc.

Value range:

• Minimum value: -1.7976931348623157E308 (negative infinity)
• Maximum value: 1.7976931348623157E308 (positive Infinity)

Note: The default value of variables of type

• ##double is 0.0.
Floating point numbers may suffer a loss of precision when saved in a computer, so caution should be used when performing comparisons or equality checks. The
• double type supports exponential notation, for example 1.23E10 represents 12,300,000,000.

Conversion:

You can use the
• Double.parseDouble() method to convert a string into a doubletype.
You can use the
• Double.toString() method to convert the double type to a string.

Example:

<code class="java">// 创建一个double变量并初始化
double myDouble = 3.141592653589793;

// 使用double类型进行数学运算
double result = myDouble * 2;

// 将double类型转换为字符串
String myDoubleString = Double.toString(result);</code>

Conclusion:

When it is necessary to represent high-precision real numbers,

The double data type is ideal in Java. Understanding its value range, caveats, and conversion methods is critical to using it correctly.

The above is the detailed content of How to use double in java. For more information, please follow other related articles on the PHP Chinese website!