问题描述
我想知道是否有办法在 C++ 中使用 char 来表示浮点数?
I'm wondering if there is a way to represent a float using a char in C++?
例如:
int main()
{
float test = 4.7567;
char result = charRepresentation(test);
return 0;
}
我读到可能使用 bitset 我可以做到,但我不太确定.
I read that probably using bitset I can do it but I'm not pretty sure.
假设我的浮点变量是二进制的 01001010 01001010 01001010 01001010.
Let's suppose that my float variable is 01001010 01001010 01001010 01001010 in binary.
如果我想要一个 4 个元素的 char 数组,第一个元素是 01001010,第二个元素是 01001010,依此类推.
If I want a char array of 4 elements, the first element will be 01001010, the second: 01001010 and so on.
我可以在 4 个元素的 char 数组中表示浮点变量吗?
Can I represent the float variable in a char array of 4 elements?
推荐答案
我怀疑你想说的是:
int main()
{
float test = 4.7567;
char result[sizeof(float)];
memcpy(result, &test, sizeof(test));
/* now result is storing the float,
but you can treat it as an array of
arbitrary chars
for example:
*/
for (int n = 0; n < sizeof(float); ++n)
printf("%x", result[n]);
return 0;
}
编辑添加:所有指出你不能将 float
放入 8 位的人当然是正确的,但实际上 OP 正在摸索理解 float
和所有原子数据类型一样,最终是一个简单的连续字节块.这对所有新手来说都不是显而易见的.
Edited to add: all the people pointing out that you can't fit a float
into 8 bits are of course correct, but actually the OP is groping towards the understanding that a float
, like all atomic datatypes, is ultimately a simple contiguous block of bytes. This is not obvious to all novices.
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