Reverses the sign of a floating-point argument.

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 is no error return.

For more compatibility information, see Compatibility.

Floating-Point Support
fabs, fabsf, fabsl
copysign, copysignf, copysignl, _copysign, _copysignf, _copysignl