Question

In Java BigDecimal class contains values as A*pow(10,B) where A is 2’s complement which non-fix bit length and B is 32bit integer.

In C# Decimal contains values as pow (–1,s) × c × pow(10,-e) where the sign s is 0 or 1, the coefficient c is given by 0 ≤ c < pow(2,96) , and the scale e is such that 0 ≤ e ≤ 28 .

And i want to convert Java BigDecimal to Something like c# Decimal in JAVA.
Can you help me .

I have some thing like this

class CS_likeDecimal
{
     
    private int hi;// for 32bit most sinificant bit of c 
    private int mid;// for 32bit in the middle  
    private int lo;// for 32 bit the last sinificant bit

    .....
    public CS_likeDecimal(BigDecimal data)
    {
                ....

    }

}

In fact I found this What's the best way to represent System.Decimal in Protocol Buffers?.

it a protocol buffer for send c# decimal ,but in the protobuff-net project use this to send message between c# (but i want between c# and JAVA)

message Decimal {
  optional uint64 lo = 1; // the first 64 bits of the underlying value
  optional uint32 hi = 2; // the last 32 bis of the underlying value
  optional sint32 signScale = 3; // the number of decimal digits, and the sign

}

Thanks,

Answer 1

the Decimal I use in protobuf-net is primarily intended to support the likely usage of protobuf-net being used at both ends of the pipe, which supports a fixed range. It sounds like the range of the two types in discussion is not the same, so: are not robustly compatible.

I would suggest explicitly using an alternative representation. I don’t know what representations are available to Java’s BigDecimal – whether there is a pragmatic byte[] version, or a string version.

If you are confident that the scale and range won’t be a problem, then it should be possible to fudge between the two layouts with some bit-fiddling.