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Questions tagged [double]

Double is a primitive data type used to store fractional numbers that holds a double-precision floating-point (often 64 bits).

In C and C++ double must be at least as large as float (another floating-point type), but its actual size can vary from system to system as it is implementation-defined. It is typically twice the size of float. Many systems store doubles in binary64, a format described in the IEEE 754 technical standard.

Java has a very strict definition for double, requiring it to be stored in binary64 (which is also called double-precision).

More information:

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LINQ query, ignoring results with certain decimal points

I need to perform a LINQ query on a large database in C#. One of the columns I need to use in the query is a double. I need to omit results that have more than 4 decimal places in this column. The database can't be changed as other programs need to…
Stuart Thomson
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How can I convert string to double?

I am developing an android app. I need to convert string to double. How can I do it?
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Storing monetary values as Doubles but using BigDecimal to calculate values

Currently some of our Hibernate entities are using Doubles to store monetary amounts, the database stores this value as a numeric(10,2). The calculation of these monetary double amounts are always calculated using BigDecimals and then the entity…
David
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Java doubles adding strangely (and no, it's not for money)

So this is the only relevant section of the code System.out.println("first term of " + firstTerm + " second term of " + secondTerm + " third term of " + finalTermHolder + " should equal " +…
Nathan
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What's wrong with this division?

I think there's a lot for me to learn about data types. Why this happens double result = ((3/8)*100).ToString(); it gives zero .. should be 37,5 ... :(
Emre
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Jack Shirazi DoubleToString java optimization problem

in Jack Shirazi book "Java Performance Tuning", he presents a way to optimize conversion from double to String. the code of the optimization can be found here: http://onjava.com/onjava/2000/12/15/graphics/DoubleToString.java however, there seem to…
Bastien
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Scaling big values

I've created simple WPF control to draw charts in my application. Now I need to draw a f(x) = 2^x function on it. All values (from specified range) must be visible on the chart - they should be scaled so that f(x) value for maxX will be on right top…
Marcin Robaszyński
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double to int16 (generation or conversion?)

fsamp = 2; deltaf = fsamp/nfft; % FFT resolution Nfreqtimestwo = 128; % Used below Nsines = Nfreqtimestwo/2 - 1; % Number of sine waves fmult = [1:Nsines]; % multiplicative factor freq_fund = fsamp/Nfreqtimestwo; freq_sines = freq_fund.*fmult;…
NickHalden
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How to write 1+1/2+1/3....+1/4999+1/5000 in java?

How to write 1+1/2+1/3....+1/4999+1/5000 in java? I have tried this but didnt work. public class Harmonic{ public static void main(String[] args){ double sum = 0; for(int i=1; i<=5000; i++){ sum+=1/i; } …
Jeff
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C++ double precision and rounding off

I have the following problem: double a = 6.005; double b = 5.995; I want to set precision of doubles 2 digits after point, for example double c = a+b;// I would like to get 11.99 not 12.00. How can I do this?
user712644
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Finding floating points in a large string

I have a large string that has a series of floating points in string. A typical string would have Item X $4.50 Description of item \r\n\r\n Item Z $4.75... There is really no rhyme or reason for the text. I have the lowest already and I need to find…
Joe Tyman
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How to extract fractional part of a double value without rounding in c

When i try to extract the fractional part of a double it seems to be rounding down in C, Is there a way to do it without rounding? double t = 8.2; int ipart = (int)t; long long val = abs((long long)(t*1000000)); long long fpart =…
Scarlet
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Cannot convert value of type 'Int' to expected argument type 'Double'

So I am following this course called "Code With Chris - 14 Day Beginner Challenge (SwiftUI)" (yes I am a beginner), and after each lesson, there is a challenge, I have almost completed the challenge but I couldn't figure out why it wouldn't work, so…
GrainsGames
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On GPU, is it possible to get more flops by combining double and float operations?

If a GPU can do N1 single precision operations per second, and N2 double precision operations per second. Is it possible, by mixing (independent) single and double precision operations to achieve N1+N2 total operations per second, or at least…
nat chouf
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Save double with dot format using StringBuilder

stringBuilder.Append(doubleVariable.ToString()); In my case it will write it as for example 0,15 and I would definitely prefer 0.15. I did not find any direct answer to that, I bet it can be applied somehow to ToString().
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