Double.Equals() Method in C# with Examples

Double.Equals() Method is used to get a value that indicates whether the two instances of Double represent the same value or not. There are total of two methods in the overload list of this method as follows:

• Equals(Double) Method
• Equals(Object) Method

Double.Equals(Double)

This method is used to return a value indicating whether this instance and a specified Double object represent the same value.

Syntax: public bool Equals (double obj); 
Here, it takes a Double object to compare to this instance.
Return Value: This method returns true if obj is equal to this instance; otherwise, false.

The below programs illustrate the use of Double.Equals() Method:

Example 1:

C#

// C# program to demonstrate the
// Double.Equals(Double)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing value1
        double value1 = 10d;

        // Declaring and initializing value2
        double value2 = 20d;

        // compare both double value
        // using Equals(Double) method
        bool status = value1.Equals(value2);

        // checking the status
        if (status)
            Console.WriteLine("{0} is equal to {1}",
                                    value1, value2);
        else
            Console.WriteLine("{0} is not equal to {1}",
                                        value1, value2);
    }
}

Output:

10 is not equal to 20

Example 2:

C#

// C# program to demonstrate the
// Double.Equals(Double)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {

        // calling get() method
        get(5d, 5d);
        get(5.5d, 4.5d);
        get(10d, 20d);
        get(7.5d, 19.5d);
    }

    // defining get() method
    public static void get(double value1, double value2)
    {

        // compare both double value
        // using Equals(Double) method
        bool status = value1.Equals(value2);

        // checking the status
        if (status)
            Console.WriteLine("{0} is equal to {1}",
                                    value1, value2);
        else
            Console.WriteLine("{0} is not equal to {1}",
                                        value1, value2);
    }
}

Output:

5 is equal to 5
5.5 is not equal to 4.5
10 is not equal to 20
7.5 is not equal to 19.5

Double.Equals(Object) Method

This method is used to returns a value indicating whether this instance is equal to a specified object or not.

Syntax: public override bool Equals (object obj); 
Here, it takes an object to compare with this instance.
Return Value: This method returns true if obj is an instance of Double and equals the value of this instance; otherwise, false. 

Below programs illustrate the use of the above-discussed method:

Example 1:

C#

// C# program to demonstrate the
// Double.Equals(Object)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing value1
        double value1 = 10d;

        // Declaring and initializing value2
        object value2 = 1 / 36;

        // compare both double value
        // using Equals(object) method
        bool status = value1.Equals(value2);

        // checking the status
        if (status)
            Console.WriteLine("{0} is equal to {1}",
                                   value1, value2);
        else
            Console.WriteLine("{0} is not equal to {1}",
                                        value1, value2);
    }
}

Output:

10 is not equal to 0

Example 2:

C#

// C# program to demonstrate the
// Double.Equals(object)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // calling get() method
        get(5d, 1 / 3);
        get(5.5d, 1 / 3);
        get(10d, 1 / 24);
        get(7.5d, 2 / 5);
    }

    // defining get() method
    public static void get(double value1, object value2)
    {

        // compare both double value
        // using Equals(object) method
        bool status = value1.Equals(value2);

        // checking the status
        if (status)
            Console.WriteLine("{0} is equal to {1}",
                                    value1, value2);
        else
            Console.WriteLine("{0} is not equal to {1}",
                                        value1, value2);
    }
}

Output:

5 is not equal to 0
5.5 is not equal to 0
10 is not equal to 0
7.5 is not equal to 0

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.double.equals?view=netframework-4.7.2