Anything related to converting a floating point number to and from other representations.
Questions tagged [floating-point-conversion]
290 questions
8
votes
6 answers
Convert float to its binary representation (using MemoryStream?)
I'd like to convert a given float into its binary representation. I tried to write the float value into a MemoryStream, read this MemoryStream byte by byte and convert the bytes into their binary representation. But every attempt failed.
"Can't…
Cubi73
- 1,891
- 3
- 31
- 52
8
votes
6 answers
Writing an image with floating point values
My code reads an RGB image, processing it to produce floating-point results. How can I write these values as an image, maintaining these floating-point values, in Matlab 7.6.0 (R2008a)?
Student
- 81
- 1
- 1
- 2
7
votes
4 answers
Understanding casts from integer to float
Could someone explain this weird looking output on a 32 bit machine?
#include
int main() {
printf("16777217 as float is %.1f\n",(float)16777217);
printf("16777219 as float is %.1f\n",(float)16777219);
return 0;
}
Output
16777217…
zzz_zzz
- 73
- 4
7
votes
2 answers
problems in floating point comparison
void main()
{
float f = 0.98;
if(f <= 0.98)
printf("hi");
else
printf("hello");
getch();
}
I am getting this problem here.On using different floating point values of f i am getting different results.
Why this is…
Adi
- 163
- 2
- 4
- 8
7
votes
3 answers
How to round a floating point number upto 3 digits after decimal point in bash
I am a new bash learner. I want to print the result of an expression given as input having 3 digits after decimal point with rounding if needed.
I can use the following code, but it does not round. Say if I give 5+50*3/20 + (19*2)/7 as input for the…
Enamul Hassan
- 5,266
- 23
- 39
- 56
7
votes
2 answers
Is there a standard C way to print floating-point values "perfectly" a la Dragon4?
Reading Here be dragons: advances in problems you didn’t even know you had I've noticed that they compare the new algorithm with the one used in glibc's printf:
Grisu3 is about 5 times faster than the algorithm used by printf in GNU libc
But at…
Ruslan
- 18,162
- 8
- 67
- 136
7
votes
2 answers
Converting Int to Float loses precision for large numbers in Swift
XCode 6.3.1 Swift 1.2
let value: Int = 220904525
let intmax = Int.max
let float = Float(value) // Here is an error probably
let intFromFloat = Int(float)
let double = Double(value)
println("intmax=\(intmax) value=\(value) float=\(float)…
kostyl
- 339
- 3
- 15
7
votes
2 answers
C++ double to long long
If i write code in c++:
long long d = 999999998.9999999994;
cout<
pirate
- 496
- 6
- 16
7
votes
1 answer
C# float precision
Can anyone please explain to me what's happening here:
using System;
using System.Text;
namespace ConsoleApplication1 {
class Program {
static void Main(string[] args) {
object o = 1000000.123f;
float f=…
Stephen Emm
- 83
- 1
- 1
- 5
7
votes
1 answer
Generate large number of unique random float32 numbers
I need to generate a binary file containing only unique random numbers, with single precision.
The purpose is then to calculate the entropy of this file and use it with other datasets entropy to calculate a ratio entropy_file/entropy_randUnique.…
SamGamgee
- 564
- 1
- 4
- 12
7
votes
1 answer
Why is IEEE-754 Floating Point not exchangable between platforms?
It has been asserted that (even accounting for byte endian-ness) IEEE754 floating point is not guaranteed to be exchangeable between platforms.
So:
Why, theoretically, is IEEE floating point not exchangeable between platforms?
Are any of these…
Damien
- 785
- 3
- 8
- 18
7
votes
3 answers
In Lua, what is #INF and #IND?
I'm fairly new to Lua. While testing I discovered #INF/#IND. However, I can't find a good reference that explains it.
What are #INF, #IND, and similar (such as negatives) and how do you generate and use them?
Nathan Goings
- 1,145
- 1
- 15
- 33
7
votes
3 answers
Convert signed IEEE 754 float to hexadecimal representation
I'm using a front-end of Lua which is unfortunately outdated, so I'm stuck with version 5.1 here, meaning the bit32 library is out of reach (which I probably could have used to convert this).
So I'm wondering if anyone knows of a way I could…
user966939
- 692
- 8
- 27
7
votes
3 answers
Convert scientific notation to decimal - python
How do I convert a scientific notation to floating point number?
Here is an example of what I want to avoid:
Python 2.7.3 (default, Apr 14 2012, 08:58:41) [GCC] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>…
pistal
- 2,310
- 13
- 41
- 65
7
votes
3 answers
Dividing 1/n always returns 0.0
I am trying to calculate p1=(1/1)*(1/2)*...*(1/n) but something is wrong and the printf gives me 0.000...0
#include
int main(void) {
int i,num;
float p3;
do {
printf ("give number N>3 : \n" );
scanf( "%d",…
user1809300
- 703
- 4
- 9
- 17