Keywords are the words in a language that are used for some internal process or represent some predefined actions. It is a keyword that is used to declare a variable that can store a floating-point value from the range of ±5.0 x 10-324 to ±1.7 x 10308. It is an alias of System.Double. Basically, it is a 64-bit double precision floating point number and have 14 to 15 digit precision.
Double Keyword occupies 8 byte (64 bits) space in the memory.
Syntax:
double variable_name = value;
We can specify a suffix d or D to represent a double value. Also floating point value without using any suffix is considered as a double value.
Example:
Input: num: 1234.5678 Output: num: 1234.5678 Size of a double variable: 8 Input: num = -67895.4322D Output: Type of num: System.Double num: -67895.4322 Size of a double variable: 8
Example 1:
// C# program for the double keyword using System;
using System.Text;
class geeks {
static void Main( string [] args)
{
// variable declaration
double num = 1234.5678;
// to print value
Console.WriteLine( "num: " + num);
// to print size
Console.WriteLine( "Size of a double variable: " + sizeof ( double ));
}
} |
Output:
num: 1234.5678 Size of a double variable: 8
Example 2:
// C# program for the double keyword using System;
using System.Text;
namespace Test {
class geeks {
static void Main( string [] args)
{
// variable declaration
double num = -67895.4322D;
// to print type of variable
Console.WriteLine( "Type of num: " + num.GetType());
// to print value
Console.WriteLine( "num: " + num);
// to print size
Console.WriteLine( "Size of a double variable: " + sizeof ( double ));
// to print minimum & maximum value of double
Console.WriteLine( "Min value of double: " + double .MinValue);
Console.WriteLine( "Max value of double: " + double .MaxValue);
// hit ENTER to exit
Console.ReadLine();
}
} } |
Output:
Type of num: System.Double num: -67895.4322 Size of a double variable: 8 Min value of double: -1.79769313486232E+308 Max value of double: 1.79769313486232E+308