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【多选题】
下列关于定点数和浮点数的叙述正确的是：A.
当浮点机和定点机中数的位数相同时，浮点数的表示范围比定点数的范围大的多。
B.
当浮点数为规格化数时，其相对精度远比定点数高。
C.
浮点数运算要分阶码部分和尾数部分，而且运算结果都要求规格化，故浮点运算步骤比定点运算步骤多，运算速度比定点运算的低，运算线路比定点运算的复杂。
D.
在溢出的判断方法上，浮点数是对规格化数的阶码进行判断，而定点数是对数值本身进行判断。
E.
浮点数在数的表示范围、数的精度和溢出处理方面均优于定点数。
F.
定点数在运算规则、运算速度及硬件成本方面优于浮点数。
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