# Complex.Subtract Method

.NET Framework 4.6 and 4.5

Subtracts one complex number from another and returns the result.

Namespace:  System.Numerics
Assemblies:   System.Runtime.Numerics (in System.Runtime.Numerics.dll)
System.Numerics (in System.Numerics.dll)

## Syntax

```public static Complex Subtract(
Complex left,
Complex right
)
```

#### Parameters

left
Type: System.Numerics.Complex

The value to subtract from (the minuend).

right
Type: System.Numerics.Complex

The value to subtract (the subtrahend).

#### Return Value

Type: System.Numerics.Complex
The result of subtracting right from left.

## Remarks

The subtraction of a complex number, c + di, from another complex number, a + bi, takes the following form:

(a - c) + (b - d)i

If the method call results in an overflow in either the real or imaginary component, the value of that component is either Double.PositiveInfinity or Double.NegativeInfinity.

Languages that do not support custom operators can use the Subtract method to perform subtraction using complex numbers.

## Examples

The following example subtracts each complex number in an array from a complex number.

```using System;
using System.Numerics;

public class Example
{
public static void Main()
{
Complex c1 = new Complex(4.93, 6.87);
Complex[] values = { new Complex(12.5, 9.6),
new Complex(4.3, -8.1),
new Complex(-1.9, 7.4),
new Complex(-5.3, -6.6) };

foreach (var c2 in values)
Console.WriteLine("{0} - {1} = {2}", c1, c2,
Complex.Subtract(c1, c2));
}
}
// The example displays the following output:
//       (4.93, 6.87) - (12.5, 9.6) = (-7.57, -2.73)
//       (4.93, 6.87) - (4.3, -8.1) = (0.63, 14.97)
//       (4.93, 6.87) - (-1.9, 7.4) = (6.83, -0.53)
//       (4.93, 6.87) - (-5.3, -6.6) = (10.23, 13.47)
```

## Version Information

#### .NET Framework

Supported in: 4.6, 4.5, 4

Supported in: 4

#### .NET for Windows Phone apps

Supported in: Windows Phone 8.1

#### Portable Class Library

Supported in: Portable Class Library