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

i need help with php header and footer
I have designed a header and footer for my site and they seem to be ok when they are running individ

date function help
i need help with date function

Code: [Select]<!DOCTYPE HTML PUBLIC "-//W3C//DTD H

IP Logger for Voting Script
Can anybody help me place an IP logger into my voting script?
I know that maybe it is not as secu

Backflush
I am looking for a report in SAP that would give me a list of all parts that are populated with a ba

RFQ Configuration - can you make PLANT field an optional field in ME42
Is there a way to make the plant field on an RFQ optional in change mode (ME42)?

explode() function problem maybe
Hi I'm having trouble searching my database. When I type two words in the search field it only searc

why isn't this PHP code working ???
it's suppose to find a name on the database.

<?php

$s = $_POST["lname&

PHP time (deadline within one week)
I have a column ['projdue'], which stores the deadline for a project.
I have PHP code and <

Inserting into MySQL Newbie
Hi ive got a slight problem where ive made a simple web form where the customer inserts the ammount

form variables from database help.
Hi all,

I would like to have a form that gives you options based on the results of an mysql q

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