`_chgsign`, `_chgsignf`, `_chgsignl`

Reverses the sign of a floating-point argument.

Syntax

double _chgsign(
   double x
);
float _chgsignf(
   float x
);
long double _chgsignl(
   long double x
);

x
The floating-point value to be changed.

The _chgsign functions return a value that's equal to the floating-point argument x, but with its sign reversed. There's no error return.

Routine	Required header
`_chgsign`	<float.h>
`_chgsignf`, `_chgsignl`	<math.h>

For more compatibility information, see Compatibility.