数值型函数:abs(num) 返回绝对值sgn(num) num>0 返回1num=0 返回0num<0 返回-1 判断数值正负hex(num)返回十六进制值直接表示:Hxx最大8位oct(num)返回八进制值直接表示: Oxx最大8位sqr(num)返回平方根num>0int(num)取整int(99.8)=99int(-99.2)=-100fix(num)取整 fix(99