extern bit _testbit_ (bit); //測試並清零位，相當於8051的JBC指令
extern unsigned char _cror_ (unsigned char, unsigned char); //字符循環右移
extern unsigned int _iror_ (unsigned int, unsigned char); //整數循環右移
extern unsigned long _lror_ (unsigned long, unsigned char); //長整數循環右移
extern unsigned char _crol_ (unsigned char, unsigned char); //字符循環左移
extern unsigned int _irol_ (unsigned int, unsigned char); //整數循環左移
extern unsigned long _lrol_ (unsigned long, unsigned char); //長整數循環左移
extern unsigned char _chkfloat_(float); //測試並返回源點數狀態
看妳的要求~~