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

Secure FTP
Hi experts,
There is no SFTP action in MII workbench.
This means it needs developing custo

OPINIONS WANTED
This is my login page code, and I want your opinion on it please!

Code: // Login ~ CHECKS

Chat Box in PHP
I was thinking in doing a Chat Box in PHP. For that I would use a form with two fields, Nick and Mes

Schedule editor
Hi,

I have a question related to Schedule editor.
If we schedule a BLS for every 30

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

Xacute search within SQL results
I have a query that is pulling data, and I want to return a specific value from the results of that

A little help in c#
i am doing a simple paint program using c# i want to draw with the mouse so i wrote the code of the

Create PHP table grid help, please
I have a MySQL database setup, now it's time for the table (gridview) design in php. Here's the prob

Converting numbers to months
The porgram works -just need the last function(month_convert_ to convert numbers to months -thanks.

SQl num_rows problem
when i try to count rows from an SQL select i get an warning

Code: [Select]$countviews = mysq

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