Doubles are giving me problems


Posted on 16th Feb 2014 07:03 pm by admin

Ok so, first of all i made a double = 0.05, but when running the debugger it shows up as 0.04999. I know this has something to do with how doubles store but its causing problems for me. Anyway, in the code I'm trying to get only the right hand side(rhs) of the double variable jdn's decimal point. So in the code example I'm only trying to get .05. But rhs isn't always going to be the same and can have up to 0.00005 <- that fifth one there(can't remember what its called - hundred thousandth?). I have constant numbers right now for the sake of testing this. Now the counter goes through starting at 0.1, to make sure everything after the decimal point is 0. It goes through fine until it gets to 0.0002 - 0.0001 and then rhs = 9.99998e-005.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#include #include #include using namespace std; int main() { double jdn = 2454115.05; double lhs = floor(jdn); double rhs = jdn - lhs; double counter = 0.1; if( rhs != 0.0 ) while( (rhs != 0.000001) || (counter != 0.00001) ) { if( (rhs - counter) <= 0 ) { counter *= 0.1; //cout << "rhs = " << rhs << endl; } else { rhs -= counter; cout << "rhs = " << rhs << endl; } } cout << "ok" << endl; return 0; }
Results:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
rhs = 0.04 rhs = 0.03 rhs = 0.02 rhs = 0.01 rhs = 0.009 rhs = 0.008 rhs = 0.007 rhs = 0.006 rhs = 0.005 rhs = 0.004 rhs = 0.003 rhs = 0.002 rhs = 0.001 rhs = 0.0009 rhs = 0.0008 rhs = 0.0007 rhs = 0.0006 rhs = 0.0005 rhs = 0.0004 rhs = 0.0003 rhs = 0.0002 rhs = 9.99998e-005

No comments posted yet

Your Answer:

Login to answer
120 Like 6 Dislike
Previous forums Next forums
Other forums

upload only text files
hi guys i want to upload only text like like (pdf,note pad and ofiice files) so can any one please t

setcookie and isset($_COOKIE(name)) seem very finnicky.
I'm currently playing around with a user system with login and registration. I'm trying to use cooki

Whats wrong with my query?
I am trying to get this query to show the appropriate ticked vehicle roof height, unless no boxs are

An odd assignment statement. Can someone explain this assignment to me?
What purpose is served by the bit of code between the two equal signs in the $installurl set? Is th

Save User Inputs while javascript reloading!
hi..
i have written a PHP code in which i reload the page when user selects a value in dropdown..

generating random codes
Hi guys n gals,

I have a requirement to generate 250,000 unique codes...

These codes a

Significance of BPM
Hi Experts,
I am a novice in BPM , I just want to know how BPM as permenant department is

Problem with array max size.
Hi to everyone,
I've got a homework about filling a bidimensional array un spiral shape, I alre

How to make URL loads only on login
On my page, when a user login he's redirects to user_home.php. I made it also to open the chat scree

PHP login form help (Done Most of It)
Hi i am having a problem, when i try logging in it is always saying "Invalid Login" im not

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



 
© indyaspeak.com. All Rights Reserved.
Play Free Quiz and Win Cash