# _chgsign, _chgsignl

Visual Studio 2010

Reverses the sign of a double-precision, floating-point or a long double-precision, floating-point argument.

```double _chgsign(
double x
);
long double _chgsignl(
long double x
);
```

## Parameters

x

Double-precision or long double-precision, floating-point value to be changed.

## Return Value

_chgsign returns a value equal to its double-precision, floating-point argument x, but with its sign reversed. _chgsignl returns a value equal to its long double-precision, floating-point argument x, but with its sign reversed. There is no error return.

## Requirements

Routine

_chgsign

<float.h>

_chgsignl

<math.h>

For more compatibility information, see Compatibility in the Introduction.

## .NET Framework Equivalent

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.