使用浮点数的基础位表示 [英] Using underlying bit representations of floats
问题描述
嗨
我想知道是否有一种方法可以使用基础位
表示浮点数。我有兴趣在
MISRA C：2004规则中创建违规行为基础位表示不得使用
使用
我使用按位运算符进行了treid但这些不可编译。
有没有办法可以使用浮点数位表示？
Hi
I am wondering if there is a way of using the underlying bit
representations of floats. I am interested in creating a violation in
MISRA C:2004 of rule "The underlying bit representations shall not be
used"
I have treid using bitwise operators but these are not compilable.
Is there a way I can use bit representations of floats?
推荐答案
ha ******** @ googlemail.com aécrit：
嗨
我想知道是否有一种方法可以使用浮点数的基础位表示。我有兴趣在MISRA C：2004规则中创建违规行为不应使用基础位表示
我使用按位运算符进行了treid但这些是不可编译。
有没有办法可以使用浮动的位表示？
Hi
I am wondering if there is a way of using the underlying bit
representations of floats. I am interested in creating a violation in
MISRA C:2004 of rule "The underlying bit representations shall not be
used"
I have treid using bitwise operators but these are not compilable.
Is there a way I can use bit representations of floats?
如果您使用IEEE754我们有：
typedef struct {
unsigned int mantissa1;
unsigned int mantissa0：31;
unsigned int one：1;
unsigned int exponent：15;
unsigned int negative：1;
unsigned int empty：16;
} _longDouble; // 80位英特尔长双
typedef结构{
unsigned int mantissa1;
unsigned int mantissa0：20;
unsigned int exponent：11;
unsigned int sign：1;
} _Double; // 64位双
typedef struct {
unsigned int尾数：23;
unsigned int exponent：8;
unsigned int sign：1;
} _Float; // 32位浮动
If you use IEEE754 we have:
typedef struct {
unsigned int mantissa1;
unsigned int mantissa0:31;
unsigned int one:1;
unsigned int exponent:15;
unsigned int negative:1;
unsigned int empty:16;
} _longDouble; // 80 bits intel long double
typedef struct {
unsigned int mantissa1;
unsigned int mantissa0:20;
unsigned int exponent:11;
unsigned int sign:1;
} _Double; // 64 bit double
typedef struct {
unsigned int mantissa:23;
unsigned int exponent:8;
unsigned int sign:1;
} _Float; // 32 bit float
抱歉一些拼写错误
规则12.12状态浮动类型的基础位表示
变量不得使用
Sorry some typos
Rule 12.12 states "the underlying bit representations of floating type
variables shall not be used"
谢谢你可以解释一下这是如何使用基础位
浮点/双打的表示。
Thanks for that can you please explain how this uses the underlying bit
representations of floats/doubles.
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