Re: How to make a Currency class from std.BigInt?
This library allow to specify the internal base of the arbitrary precision numbers( default is decimal), as well as allows specification of the precision of floating point values. Each floating point number precision can be read with .precision(). Also supports specification of rounding modes. Seems like it would be a nice project for a port to D. http://www.hvks.com/Numerical/arbitrary_precision.html
Re: How to make a Currency class from std.BigInt?
The next version https://bpaste.net/show/dc3c5f10f2ca I use https://github.com/dsimcha/Rational/blob/master/rational.d I want to do it: auto c = new Currencies!Rational.rational.Rational!(BigInt); where Rational.rational.Rational it is std.rational.Rational I get the error: Error: template instance Currencies!(Rational) does not match template declaration Currencies(T)
Re: How to make a Currency class from std.BigInt?
https://github.com/acmeism/RosettaCodeData/blob/master/Task/Arithmetic-Rational/D/arithmetic-rational.d
Re: How to make a Currency class from std.BigInt?
With eris lib some problems, the first error: .../.dub/packages/eris-0.0.1/eris/integer/digits.d(241): Error: cannot implicitly convert expression (digits.length) of type ulong to int What can I import to use rational numbers? I found it https://github.com/dsimcha/Rational/blob/master/rational.d https://github.com/d-gamedev-team/gfm/blob/master/math/gfm/math/rational.d but I do not understand what the story ended with rational numbers in D.
Re: How to make a Currency class from std.BigInt?
Thanks. Do I need to use rational fractions for the Currencies class?
Re: How to make a Currency class from std.BigInt?
On Saturday, 31 January 2015 at 15:02:09 UTC, Colin wrote: Maybe you can articulate it in one post what this class is trying to achieve? Maybe this? https://github.com/andersonpd/decimal/blob/master/decimal/bigfloat.d The main thing is not to lose currency in calculations that use arithmetic.
Re: How to make a Currency class from std.BigInt?
The next version, which does not work: https://bpaste.net/show/b9c85de68d07
Re: How to make a Currency class from std.BigInt?
On 31.01.15 15:45, RuZzz wrote: Maybe I need good examples on C++, for this class, because a lot of examples on C++. Maybe this can help you: https://github.com/andersonpd/decimal
Re: How to make a Currency class from std.BigInt?
I want to understand the correct architecture of the class.
Re: How to make a Currency class from std.BigInt?
On Saturday, 31 January 2015 at 13:45:22 UTC, RuZzz wrote: I want to understand the correct architecture of the class. Sorry, you still did not state your problem (or what you are trying to achieve) clearly. Writing down a clear problem description is likely to get you halfway to the solution.
Re: How to make a Currency class from std.BigInt?
On 31.01.15 15:56, zeljkog wrote: On 31.01.15 15:45, RuZzz wrote: Maybe I need good examples on C++, for this class, because a lot of examples on C++. Maybe this can help you: https://github.com/andersonpd/decimal Also http://code.dlang.org/packages/eris
Re: How to make a Currency class from std.BigInt?
Maybe I need good examples on C++, for this class, because a lot of examples on C++.
Re: How to make a Currency class from std.BigInt?
I am looking for not only free solutions.
Re: How to make a Currency class from std.BigInt?
On Saturday, 31 January 2015 at 14:26:45 UTC, RuZzz wrote: The next version, which does not work: https://bpaste.net/show/b9c85de68d07 I really dont understand what your trying to achieve here. Maybe you can articulate it in one post what this class is trying to achieve?
Re: How to make a Currency class from std.BigInt?
The next version https://bpaste.net/show/9468f24d9df0
Re: How to make a Currency class from std.BigInt?
How to get amount of digit after point in a double for to get integer from a double? assert(amountAfterPoint(1.456) == 3); assert(amountAfterPoint(0.6) == 5);
Re: How to make a Currency class from std.BigInt?
without to!string
Re: How to make a Currency class from std.BigInt?
On Saturday, 31 January 2015 at 12:07:23 UTC, RuZzz wrote:
How to get amount of digit after point in a double for to get
integer from a double?
assert(amountAfterPoint(1.456) == 3);
assert(amountAfterPoint(0.6) == 5);
How about a loop like
import std.stdio;
void main(){
writefln(%s, 1.45.numDigits);// prints 2
writefln(%s, 1.452343.numDigits);// prints 6
writefln(%s, 1.0.numDigits);// prints 0
}
long numDigits(double num){
long i=0;
double n=num;
while(true){
if(n - (cast(long)n) == 0){
return i;
}
i++;
n *= 10;
}
}
Re: How to make a Currency class from std.BigInt?
What do I need to learn?
Re: How to make a Currency class from std.BigInt?
On Friday, 30 January 2015 at 20:34:53 UTC, RuZzz wrote: What do I need to learn? c[BTC][N-01] = 1.0002;//Error: cannot implicitly convert expression (1) of type double to axfinance.api.currencies.Currencies As I see it, there is no constructor in your class with a double argument. So you cannot assign a double (1.0002) to a Currencies struct (c[BTC][N-01]).
How to make a Currency class from std.BigInt?
module axfinance.api.currencies;
import std.array, std.stdio, std.system, std.bigint, std.conv;
class Currencies
{
public:
this(ulong pf)
{
exponent(pf);
}
bool integer(BigInt pb)
{
zInt = pb;
return true;
}
string value()
{
string res = to!string(zInt);
insertInPlace(res, res.length - zExp,.);
return res;
}
private:
bool exponent(ulong pe)
{
zExp = pe;
return true;
}
BigInt zInt;
ulong zExp;
}
unittest
{
double d1 = 45.67;
immutable LIM_FIAT = 2, LIM_EXCH = 6, LIM_CRYP = 8;
auto c = [ BTC:[N-01:new Currencies(LIM_CRYP), N-02:new
Currencies(LIM_CRYP), SUM1:new Currencies(LIM_CRYP)],
CNY:[N-01:new Currencies(LIM_FIAT), N-02:new
Currencies(LIM_EXCH), N-03:new Currencies(LIM_CRYP), SUM1:new
Currencies(LIM_CRYP), SUM2:new Currencies(LIM_CRYP)]];
// EUR, LTC, RUB;
c[BTC][N-01] = 1.0002;//Error: cannot implicitly convert
expression (1) of type double to
axfinance.api.currencies.Currencies
c[BTC][N-02] = 15.0002+13455565.45665435;
c[BTC][SUM1] = c[BTC][N-01] + c[BTC][N-02];
assert(c[BTC][SUM1] == 13455581.45665437);
c[CNY][N-01] = 1.02;
c[CNY][N-02] = 0.01;
c[CNY][N-03] = 0.0001;
c[CNY][SUM1] = c[CNY][N-01] + c[CNY][N-02];
assert(c[CNY][SUM1] == 1.03);
assert(to!double(c[CNY][SUM1]) == 1.03);
c[CNY][SUM2] = c[CNY][N-01] + c[CNY][N-03];
assert(c[CNY][SUM2] == 1.0201);
}
