在C ++中转储十六进制浮点数 [英] Dump hex float in C++
问题描述
我试过以下:
std::cout << std::hex << 17.0625;
但是它以十进制转储。我想看到11.01(十六进制为17.0625)。如何以十六进制打印一些浮点值?
But it dumped it in decimal. I'd like to see 11.01 (17.0625 in hex). How can I print some floating point value in hex?
请不要提供类似的解决方案:
Please do not offer solutions like:
void outhexdigits(std::ostream& out, fp_t d, int max_chars=160)
{
while(d > 0. && max_chars)
{
while(d < 1. && max_chars){
out << '0';
--max_chars;
d*=16;
}
if (d>=1. && max_chars) {
int i = 0;
while (d>=1.)
++i, --d;
out << std::hex << i;
--max_chars;
}
}
}
STL / boost中十六进制的浮点数?
Is there any way to dump float numbers in hex in STL/boost?
推荐答案
其他人已经建议了一个C ++ 11解决方案,但是你的问题没有C ++ 11标签。这里是ISO C99解决方案,使用ISO C99标准中的%a
和格式说明符。
Others have already suggested a C++11 solution but your question doesn't have the C++11 tag. Here is an ISO C99 solution, using the %a
and %la
format specifiers from the ISO C99 Standard.
我想看到11.01(十六进制为17.0625)。
I'd like to see 11.01 (17.0625 in hex).
以下程序打印 0X1.11P + 4
。
#include <stdio.h>
int main() {
double x = 17.0625;
printf("17.0625 in hexadecimal is: %A\n", x);
}
是显示如何以十六进制格式读取和写入浮点数的示例。
Here is an example showing how to read and write floating point numbers in hexadecimal format.
#include <stdio.h>
int main() {
double x = 0.1;
char* str = "0X1.999999999999AP-4";
printf("0.1 in hexadecimal is: %A\n", x);
printf("Now reading %s\n", str);
/* in a production code I would check for errors */
sscanf(str, "%lA", &x); /* note: %lA is used! */
printf("It equals %g\n", x);
}
如果可移植性很重要,这是我认为合理的方法。
If portability matters or you are stuck with an older compiler, it is a reasonable approach in my opinion.
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