double_t in C99

Posted by yCalleecharan on Stack Overflow See other posts from Stack Overflow or by yCalleecharan
Published on 2010-04-16T18:10:30Z Indexed on 2010/04/16 18:13 UTC
Read the original article Hit count: 438

Filed under:

double

|

c99

Hi, I just read that C99 has double_t which should be at least wide as double. Does this imply that it gives more precision digits after the decimal place? More than the usual 15 digits for double?.

Secondly, how to use it: Is only including #include enough? I read that one has to set the FLT_EVAL_METHOD to 2 for long double. How to do this? As I work with numerical methods, I would like maximum precision without using an arbitrary precision library.

Thanks a lot...

© Stack Overflow or respective owner

Related posts about double

Using delegates in C# (Part 2)

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Part 1 of this post can be read here. We are now about to see the different syntaxes for invoking a delegate and some c# syntactic sugar which allows you to code faster. We have the following console application. 1: public delegate double Operation(double x, double y); 2: 3: public… >>> More
How to rotate a set of points on z = 0 plane in 3-D, preserving pairwise distances?

as seen on Game Development - Search for 'Game Development'
I have a set of points double n[] on the plane z = 0. And I have another set of points double[] m on the plane ax + by + cz + d = 0. Length of n is equal to length of m. Also, euclidean distance between n[i] and n[j] is equal to euclidean distance between m[i] and m[j]. I want to rotate n[] in 3-D… >>> More
dividing double by double gives weird results - Java

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am trying to do the following 33.33333333333333/100.0 to get 0.333333333333333 however when I run System.out.println(33.33333333333333/100.0); I get 0.33333333333333326 as the output, similarly when I run System.out.println(33.33333333333333/1000.0); I get 0.033333333333333326 as the output… >>> More
C# (4): double minus double giving precision problems

as seen on Stack Overflow - Search for 'Stack Overflow'
I have come across a precision issue with double in .NET I thought this only applied to floats but now I see that double is a float. double test = 278.97 - 90.46; Debug.WriteLine(test) //188.51000000000005 //correct answer is 188.51 What is the correct way to handle this? Round? Lop off the unneeded… >>> More
Is there a Math.atan2 substitute for j2ME? Blackberry development

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a wide variety of locations stored in my persistent object that contain latitudes and longitudes in double(43.7389, 7.42577) format. I need to be able to grab the user's latitude and longitude and select all items within, say 1 mile. Walking distance. I have done this in PHP so I snagged my… >>> More

Related posts about c99

Signedness of enum in C/C99/C++/C++x/GNU C/GNU C99

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello Is enum type signed or unsigned? Is the Signedness of enums differ in C/C99/ANSI C/C++/C++x/GNU C/ GNU C99? Thanks >>> More
C99 and floating point environment

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I was looking at new features of C99 and saw the floating point environment: #include <fenv.h> My question is simple. If I'm performing floating point number computations, do I have to include the above preprocessor directive in my code? If no, then what does this directive do and when… >>> More
MVS 2008 and C99

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I read with interest the post "How universally is C99 supported ?". One of the comments therein points that Microsoft doesn't support C99. But the comment symbol // works with MVS 2008 and this symbol is in C99. I have two questions: To what extent MVS 2008 support C99? Is it ok in the same… >>> More
sscanf + c99 not working on some platforms ?

as seen on Stack Overflow - Search for 'Stack Overflow'
When I compile a simple Hello World! program that uses the sscanf function on my local Debian lenny x64, it works. But when I upload the same program to the server running CentOS x86, it will not work. If I do not use sscanf, then the program works on both computers. gcc -std=c99 -O2 -pipe -m32 If… >>> More
How to use make and compile as C99?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to compile a linux kernel module using a Makefile: obj-m += main.o all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean Which gives me: main.c:54: warning: ISO C90 forbids mixed declarations and… >>> More