Math.Sqrt Method
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Returns the square root of a specified number.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function Sqrt ( _
d As Double _
) As Double
[SecuritySafeCriticalAttribute]
public static double Sqrt(
double d
)
Parameters
- d
Type: System.Double
A number.
Return Value
Type: System.Double
Value of d |
Returns |
|---|---|
Zero, or positive |
The positive square root of d. |
Negative |
If d is equal to NaN or PositiveInfinity, that value is returned.
Examples
The square root of the area of a square represents the length of any side of the square. The following example displays the area of some cities in the United States and gives an impression of each city's size if it were represented by a square.
Module Example
Public Sub Demo(outputBlock As System.Windows.Controls.TextBlock)
outputBlock.FontFamily = New System.Windows.Media.FontFamily("Courier New")
' Create an array containing the area of some squares.
Dim areas() As Tuple(Of String, Double) =
{ Tuple.Create("Sitka, Alaska", 2870.3),
Tuple.Create("New York City", 302.6),
Tuple.Create("Los Angeles", 468.7),
Tuple.Create("Detroit", 138.8),
Tuple.Create("Chicago", 227.1),
Tuple.Create("San Diego", 325.2) }
outputBlock.Text += String.Format("{0,-18} {1,14:N1} {2,30}", "City", "Area (mi.)",
"Equivalent to a square with:") + vbCrLf
outputBlock.Text += vbCrLf
For Each area In areas
outputBlock.Text += String.Format("{0,-18} {1,14:N1} {2,14:N2} miles per side",
area.Item1, area.Item2,
Math.Round(Math.Sqrt(area.Item2), 2)) + vbCrLf
Next
End Sub
End Module
' The example displays the following output:
' City Area (mi.) Equivalent to a square with:
'
' Sitka, Alaska 2,870.3 53.58 miles per side
' New York City 302.6 17.40 miles per side
' Los Angeles 468.7 21.65 miles per side
' Detroit 138.8 11.78 miles per side
' Chicago 227.1 15.07 miles per side
' San Diego 325.2 18.03 miles per side
using System;
using System.Windows.Media;
public class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
outputBlock.FontFamily = new FontFamily("Courier New");
// Create an array containing the area of some squares.
Tuple<string, double>[] areas =
{ Tuple.Create("Sitka, Alaska", 2870.3),
Tuple.Create("New York City", 302.6),
Tuple.Create("Los Angeles", 468.7),
Tuple.Create("Detroit", 138.8),
Tuple.Create("Chicago", 227.1),
Tuple.Create("San Diego", 325.2) };
outputBlock.Text += String.Format("{0,-18} {1,14:N1} {2,30}\n\n", "City", "Area (mi.)",
"Equivalent to a square with:");
foreach (var area in areas)
outputBlock.Text += String.Format("{0,-18} {1,14:N1} {2,14:N2} miles per side\n",
area.Item1, area.Item2, Math.Round(Math.Sqrt(area.Item2), 2));
}
}
// The example displays the following output:
// City Area (mi.) Equivalent to a square with:
//
// Sitka, Alaska 2,870.3 53.58 miles per side
// New York City 302.6 17.40 miles per side
// Los Angeles 468.7 21.65 miles per side
// Detroit 138.8 11.78 miles per side
// Chicago 227.1 15.07 miles per side
// San Diego 325.2 18.03 miles per side
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.