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double keyword in C#

C# double keyword: Here, we are going to learn about the double keyword in C#, what is double keyword, how to use it in C#?
Submitted by IncludeHelp, on March 07, 2019

C# double keyword

In C#, float is a keyword which is used to declare a variable that can store a floating point value between the range of ±1.5 x 10−45 to ±3.4 x 1038. float keyword is an alias of System.Single.

It occupies 8 byte (64 bits) space in the memory.

Note: Any floating point value without using any suffix is considered as a double value. We can also specify a suffix d or D to represent a double value.


    double variable_name = value;

C# code to demonstrate example of double keyword

Here, we are declaring a double variable num, initializing it with the value 12345.6789 and printing its value, type, and size of a double type variable.

using System;
using System.Text;

namespace Test
    class Program
        static void Main(string[] args)
            //variable declaration
            double num = 12345.6789;

            //printing value
            Console.WriteLine("num: " + num);
            //printing type of variable
            Console.WriteLine("Type of num: " + num.GetType());
            //printing size
            Console.WriteLine("Size of a double variable: " + sizeof(double));
            //printing 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


num: 12345.6789
Type of num: System.Double
Size of a double variable: 8
Min value of double: -1.79769313486232E+308
Max value of double: 1.79769313486232E+308

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