We recommend using Visual Studio 2017



The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at _set_controlfp.

Sets the floating-point control word.

void __cdecl _set_controlfp(  
    unsigned int newControl,  
    unsigned int mask  


New control-word bit values.

Mask for new control-word bits to set.


The _set_controlfp is similar to _control87, but it only sets the floating-point control word to newControl. The bits in the values indicate the floating-point control state. The floating-point control state allows the program to change the precision, rounding, and infinity modes in the floating-point math package. You can also mask or unmask floating-point exceptions using _set_controlfp. For more information, see _control87, _controlfp, __control87_2.

This function is deprecated when compiling with /clr (Common Language Runtime Compilation) or /clr:pure because the common language runtime only supports the default floating-point precision.

RoutineRequired headerCompatibility
_set_controlfp<float.h>x86 processor only

For more compatibility information, see Compatibility in the Introduction.

Floating-Point Support
_clear87, _clearfp
_status87, _statusfp, _statusfp2