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digitalmars.D.learn - decimal type in d

reply vit <vit vit.vit> writes:
Hello, I want read decimal type from sql db, do some arithmetic 
operations inside D program and write it back to DB. Result need 
to be close to result as if this operations was performed in sql 

Exists this kind of library ind D? (ideally `pure  safe  nogc 
nothrow`).
May 15 2022
next sibling parent reply IGotD- <nise nise.com> writes:
On Sunday, 15 May 2022 at 13:26:30 UTC, vit wrote:

 Hello, I want read decimal type from sql db, do some arithmetic 
 operations inside D program and write it back to DB. Result 
 need to be close to result as if this operations was performed 

 Exists this kind of library ind D? (ideally `pure  safe  nogc 
 nothrow`).


This also something I wondered, it should be standard in the D 
library. Implementing it can be done straight forward with 
existing D language primitives, essentially a struct.


value but the exponent is a power of 10 (internally total 16 
bytes). This means that for "simple" mathematics rational decimal 
values remains rational decimals values and not some rounded 
value that would happen if you would use normal floating point 
values. The decimal type is essential for financial calculations.
May 16 2022
parent bauss <jj_1337 live.dk> writes:
On Monday, 16 May 2022 at 09:46:57 UTC, IGotD- wrote:

 On Sunday, 15 May 2022 at 13:26:30 UTC, vit wrote:

 Hello, I want read decimal type from sql db, do some 
 arithmetic operations inside D program and write it back to 
 DB. Result need to be close to result as if this operations 

 Exists this kind of library ind D? (ideally `pure  safe  nogc 
 nothrow`).


 This also something I wondered, it should be standard in the D 
 library. Implementing it can be done straight forward with 
 existing D language primitives, essentially a struct.


 point value but the exponent is a power of 10 (internally total 
 16 bytes). This means that for "simple" mathematics rational 
 decimal values remains rational decimals values and not some 
 rounded value that would happen if you would use normal 
 floating point values. The decimal type is essential for 
 financial calculations.




Here's the implementation if anyone needs it:

https://referencesource.microsoft.com/#mscorlib/system/decimal.cs,1b2858baf311cbf9

Should be fairly straightforward to implement.
May 16 2022
prev sibling parent reply Steven Schveighoffer <schveiguy gmail.com> writes:
On 5/15/22 9:26 AM, vit wrote:

 Hello, I want read decimal type from sql db, do some arithmetic 
 operations inside D program and write it back to DB. Result need to be 
 close to result as if this operations was performed in sql DB. Something 

 Exists this kind of library ind D? (ideally `pure  safe  nogc nothrow`).


https://code.dlang.org/search?q=decimal

-Steve
May 16 2022
parent vit <vit vit.vit> writes:
On Monday, 16 May 2022 at 09:59:41 UTC, bauss wrote:

 On Monday, 16 May 2022 at 09:46:57 UTC, IGotD- wrote:

 On Sunday, 15 May 2022 at 13:26:30 UTC, vit wrote:

 [...]


 This also something I wondered, it should be standard in the D 
 library. Implementing it can be done straight forward with 
 existing D language primitives, essentially a struct.


 point value but the exponent is a power of 10 (internally 
 total 16 bytes). This means that for "simple" mathematics 
 rational decimal values remains rational decimals values and 
 not some rounded value that would happen if you would use 
 normal floating point values. The decimal type is essential 
 for financial calculations.




 Here's the implementation if anyone needs it:

 https://referencesource.microsoft.com/#mscorlib/system/decimal.cs,1b2858baf311cbf9

 Should be fairly straightforward to implement.


Thanks, but it is not full implementation of decimal, arithmetic 
operator are missing.



On Monday, 16 May 2022 at 16:41:33 UTC, Steven Schveighoffer 
wrote:

 On 5/15/22 9:26 AM, vit wrote:

 Hello, I want read decimal type from sql db, do some 
 arithmetic operations inside D program and write it back to 
 DB. Result need to be close to result as if this operations 

 Exists this kind of library ind D? (ideally `pure  safe  nogc 
 nothrow`).


 https://code.dlang.org/search?q=decimal

 -Steve


Thanks, most of the packages are incomplete or too old (doesn't 
compile), but this one https://code.dlang.org/packages/decimal 
can by modified to work for my use.
May 17 2022