double_Keyword

ゝ一世哀愁。 2021-11-05 08:24 247阅读 0赞

## double Java Keyword with Examples ##

The double keyword is used to create a double primitive type.  
A double variable may store a double−precision floating point value. Double precision, as denoted by the double keyword, uses 64 bits to store a value.  
Double precision is actually faster than single precision on some modern processors that have been optimized for high-speed mathematical calculations.  
The Double class wraps a value of the primitive type double in an object. An object of type Double contains a single field whose type is double.  
The below diagram shows how to create double primitive data type using a double keyword.

### double Java Keyword Examples ###

Here is a short program that uses double variables to compute the area of a circle:

// Compute the area of a circle.
    class Area {
        public static void main(String args[]) {
            double pi, r, a;
            r = 10.8; // radius of circle
            pi = 3.1416; // pi, approximately
            a = pi * r * r; // compute area
            System.out.println("Area of circle is " + a);
        }
    }

Output:

Area of circle is 366.436224

double_Keyword

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