如何控制浮点异常.

//浮点异常的控制位

#define FPUEM_INVALIDOP 0x01

#define FPUEM_DENORMALOP 0x02

#define FPUEM_ZERODIVIDE 0x04

#define FPUEM_OVERFLOW 0x08

#define FPUEM_UNDERFLOW 0x10

#define FPUEM_PRECISON 0x20

#define __FORCE_INLINE__ __inline

/*----------------------------------------------------------

打开指定的浮点异常

-----------------------------------------------------------*/

__FORCE_INLINE__ static void enableFloatException(__int16 excWord = 0x000f)

{

__int16 cw;

__asm

{

not excWord

fstcw cw

mov ax , excWord

and cw , ax

fldcw cw

}

}

/*----------------------------------------------------------

关闭指定的浮点异常

-----------------------------------------------------------*/

__FORCE_INLINE__ static void disableFloatException(__int16 excWord = 0x000f)

{

__int16 cw;

__asm

{

fstcw cw

mov ax , excWord

or cw , ax

fldcw cw

}

}

int _tmain(int argc, _TCHAR* argv[])

{

int a = 10;

float b = 0;

float c;

float pi = 3.1415926/2.0 ;

__int16 cw=0x0000;

enableFloatException();

c = a/b;

disableFloatException();

c= a/b;

return c;

}