Complex.ToString Method (String)


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

Converts the value of the current complex number to its equivalent string representation in Cartesian form by using the specified format for its real and imaginary parts.

Namespace:   System.Numerics
Assembly:  System.Numerics (in System.Numerics.dll)

public string ToString(
	string format


Type: System.String

A standard or custom numeric format string.

Return Value

Type: System.String

The string representation of the current instance in Cartesian form.

Exception Condition

format is not a valid format string.

The string representation of the complex number returned by this method displays the number using its Cartesian coordinates in the form (a, b), where a is the real part of the complex number, and b is its imaginary part. Both a and b are formatted using the format string specified by format. The format parameter can be any valid standard numeric format specifier, or any combination of custom numeric format specifiers. If format is equal to String.Empty or is null, the real and imaginary parts of the complex number are formatted with the general format specifier ("G"). If format is any other value, the method throws a FormatException.

The .NET Framework provides extensive formatting support, which is described in greater detail in the following topics:

The format of the returned string is determined by the NumberFormatInfo object for the current culture. Depending on the format parameter, this object controls symbols such as the negative sign, the group separator, and the decimal point symbol in the output string. To provide formatting information for cultures other than the current culture, call the ToString(String, IFormatProvider) overload.

The following example initializes a complex number and displays it using several standard format strings.

using System;
using System.Numerics;

public class Example
   public static void Main()
      Complex[] c = { new Complex(17.3, 14.1), 
                      new Complex(-18.9, 147.2), 
                      new Complex(13.472, -18.115), 
                      new Complex(-11.154, -17.002) };
      string[] formats = { "F2", "N2", "G5" }; 

      foreach (Complex c1 in c)
         foreach (string format in formats)
            Console.WriteLine("{0}: {1}    ", format, c1.ToString(format));

// The example displays the following output:
//       F2: (17.30, 14.10)
//       N2: (17.30, 14.10)
//       G5: (17.3, 14.1)
//       F2: (-18.90, 147.20)
//       N2: (-18.90, 147.20)
//       G5: (-18.9, 147.2)
//       F2: (13.47, -18.12)
//       N2: (13.47, -18.12)
//       G5: (13.472, -18.115)
//       F2: (-11.15, -17.00)
//       N2: (-11.15, -17.00)
//       G5: (-11.154, -17.002)

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 4.0
Windows Phone
Available since 8.1
Return to top