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.
- MathF.Round(Single) Method
- MathF.Round(Single, Int32) Method
- MathF.Round(Single, Int32, MidpointRounding) Method
- 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 Beginner { // 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)); } } |
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 Beginner { // 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)); } } |
Rounded value of 12.43456 is 12.4346 Rounded value of 12.63457 is 12.63
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