Math.Sqrt(Double) Metoda

Definicja

Returns the square root of a specified number.Returns the square root of a specified number.

public:
 static double Sqrt(double d);
public static double Sqrt (double d);
static member Sqrt : double -> double
Public Shared Function Sqrt (d As Double) As Double

Parametry

d
Double

The number whose square root is to be found.The number whose square root is to be found.

Zwraca

Jedna z wartości w tabeli poniżej.One of the values in the following table.

d parameterd parameter Wartość zwracanaReturn value
Zero or positiveZero or positive The positive square root of d.The positive square root of d.
UjemneNegative NaN
Equals NaNEquals NaNNaN
Equals PositiveInfinityEquals PositiveInfinityPositiveInfinity

Przykłady

The square root of the area of a square represents the length of any side of the square.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.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.

// 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) };

Console.WriteLine("{0,-18} {1,14:N1} {2,30}\n", "City", "Area (mi.)", 
                  "Equivalent to a square with:");

foreach (var area in areas)
  Console.WriteLine("{0,-18} {1,14:N1} {2,14:N2} miles per side", 
                    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
Module Example
   Public Sub Main()
      ' 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) }

      Console.WriteLine("{0,-18} {1,14:N1} {2,30}", "City", "Area (mi.)", 
                        "Equivalent to a square with:")
      Console.WriteLine()
      For Each area In areas
        Console.WriteLine("{0,-18} {1,14:N1} {2,14:N2} miles per side", 
                          area.Item1, area.Item2, Math.Round(Math.Sqrt(area.Item2), 2))        
      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

Dotyczy

Zobacz też