# C# Math - CopySign() Method

The C# CopySign() method returns a number with magnitude of first argument and sign of second argument.

### Syntax

```public static double CopySign (double magnitude, double sign);
```

### Parameters

 `magnitude` Specify a value providing the magnitude of the result. `sign` Specify a value providing the sign of the result.

### Return Value

Returns a number with magnitude of first argument and sign of second argument.

### Example:

In the example below, CopySign() method returns a number with magnitude of first argument and sign of second argument.

```using System;

class MyProgram {
static void Main(string[] args) {
Console.WriteLine("Math.CopySign(48.45, 3) = "
+ Math.CopySign(48.45, 3));
Console.WriteLine("Math.CopySign(48.45, -3) = "
+ Math.CopySign(48.45, -3));
Console.WriteLine("Math.CopySign(-48.45, 3) = "
+ Math.CopySign(-48.45, 3));
Console.WriteLine("Math.CopySign(-48.45, -3) = "
+ Math.CopySign(-48.45, -3));
Console.WriteLine("Math.CopySign(Double.NegativeInfinity, 2) = "
+ Math.CopySign(Double.NegativeInfinity, 2));
Console.WriteLine("Math.CopySign(Double.PositiveInfinity, -3) = "
+ Math.CopySign(Double.PositiveInfinity, -3));
}
}
```

The output of the above code will be:

```Math.CopySign(48.45, 3) = 48.45
Math.CopySign(48.45, -3) = -48.45
Math.CopySign(-48.45, 3) = 48.45
Math.CopySign(-48.45, -3) = -48.45
Math.CopySign(Double.NegativeInfinity, 2) = Infinity
Math.CopySign(Double.PositiveInfinity, -3) = -Infinity
```

❮ C# Math Methods

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