MathF.Round() Method in C# with Examples | Set – 1

In C#, MathF.Round() is a MathF class method which is used to round a value to the nearest integer or to the particular number of fractional digits. This method can be overloaded by changing the number and type of arguments passed. There are 4 methods in the overload list of the MathF.Round() method.

1. MathF.Round(Single) Method
2. MathF.Round(Single, Int32) Method
3. MathF.Round(Single, Int32, MidpointRounding) Method
4. MathF.Round(Single, MidpointRounding) Method

Here, we will discuss the first two methods.

MathF.Round(Single) Method

This method rounds a single-precision floating-point value to the nearest integer value.

Syntax: public static float Round (float x);
Here, x is a singlefloating-point number which is to be rounded. Type of this parameter is System.Single.

Return Type:It returns the integer nearest to x and return type is System.Single.

Note: In case if the fractional component of x is halfway between two integers, one of which is even and the other odd, then the even number is returned.

Example:

// C# program to demonstrate the
// MathF.Round(Single) method
using System;

class Geeks {

    // Main method
    static void Main(string[] args)
    {

        // Case-1
        // A float value whose fractional part is
        // less than the halfway between two
        // consecutive integers
        float dx1 = 12.434565f;

        // Output value will be 12
        Console.WriteLine("Rounded value of " + dx1 +
                          " is " + MathF.Round(dx1));

        // Case-2
        // A float value whose fractional part is
        // greater than the halfway between two
        // consecutive integers
        float dx2 = 12.634565f;

        // Output value will be 13
        Console.WriteLine("Rounded value of " + dx2 +
                          " is " + MathF.Round(dx2));
    }
}

Output:

Rounded value of 12.43456 is 12
Rounded value of 12.63457 is 13

MathF.Round(Single, Int32) Method

This method rounds a single precision floating-point value to a specified number of fractional digits.

Syntax: public static float Round (float x, int digits);

Parameters:
x: A single floating-point number which is to be rounded. Type of this parameter is System.Single.
y: It is the number of fractional digits in the returned value. Type of this parameter is System.Int32.

Return Type: It returns the integer nearest to x which contains a number of fractional digits equal to y and return type is System.Single.

Exception: This method will give ArgumentOutOfRangeException if the value of y is less than 0 or greater than 15.

Example:

// C# program to demonstrate the
// MathF.Round(Single, Int32) Method
using System;

class Geeks {

    // Main method
    static void Main(string[] args)
    {

        // float type
        float dx1 = 12.434565f;

        // using method
        Console.WriteLine("Rounded value of " + dx1 +
                      " is " + MathF.Round(dx1, 4));

        // float type
        float dx2 = 12.634565f;

        // using method
        Console.WriteLine("Rounded value of " + dx2 +
                       " is " + MathF.Round(dx2, 2));
    }
}

Output:

Rounded value of 12.43456 is 12.4346
Rounded value of 12.63457 is 12.63