Double Data Type in JAVA with Program Example

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. All transcendental math
functions, such as sin( ), cos( ), and sqrt( ), return double values. When you need to
maintain accuracy over many iterative calculations, or are manipulating large-valued
numbers, double is the best choice.
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);
}
}

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